A Review of the Systems of Ethics Founded on the Theory of Evolution Part 22

"Experience never gives us an example of an isolated system; on the contrary, every system is a part of higher systems. The inner relations of its stability are not conditioned by its own parts only, but also, more or less, by those of other systems, so that the destruction of one part-system is always only in the direction towards the stability of a higher, ultimately of the highest, system; that is, of the system of the universe."

"Thus the teleological principle coincides with the principle of the Tendency to Stability, and at the same time the latter const.i.tutes the link between the former and the law of Causality. Though, in truth, this manner of looking at the matter signifies a generalization of the concept of 'end,' since it defines _all_ stable conditions as ends. The view is justified, however, by the fact that the greatest possible physical satisfaction--for us, the criterion of teleology--is always bound up with the longest possible preservation or slow change of a stable organic condition. The _physical_ Tendency to Stability 'bears with it a _psychical_ tendency to the attainment and conservation of just those conditions' towards which the physical tendency is directed."

Of the fact that Lange "feels the lack of the proof of this 'Tendency to Stability,'" Dr. Petzoldt says: "But how is there a need of proof here?

To prove is to refer back to known facts. But what is there in Fechner's remarks that stands in need of such a reference? They simply draw our attention to the result of evolution as a state which bears, in itself, the guarantee of some continuance. Can any one contest this? Is there anything further to prove? It is said that Gauss once remarked that Lagrange's equations of motion are not proved, but only historically stated. The case is exactly the same here. The fact is attested, merely, that evolution ends in a stable condition; and herein lies the pith and the great merit of the theory of the Tendency to Stability."

Dr. Petzoldt criticises, among other things, especially Fechner's concept of approximate stability, in that no distinction is made by the author between three different cases. The first case comprises forms of motion in which periodicity is only approximate, but in which, nevertheless, no retrogression in stability takes place; this case is ill.u.s.trated by our solar system. The second case comprises forms of motion in which the stability increases up to a certain point, but beyond this, despite relative constancy in outer conditions, decreases again until complete destruction of the system supervenes; an ill.u.s.tration of this form of motion is found in all organisms. The third case comprises forms of motion which we cannot concede to be stable. "For, if we ascribe periodic motion to pendula and musical strings which vibrate in a resisting medium, this is nevertheless a periodicity, which continually changes _in the same sense_, and we certainly cannot say that pendula and strings approach, in a resisting medium, a condition of absolute, through a condition of approximate, stability. We recognize in these vibrations, decreasing in amplitude, merely unstable changes which tend toward a final stable condition,--namely that of rest."

The author finds a further ground of criticism in Fechner's a.s.sertion that organisms are entirely dependent upon the periodicity of their functions. Only a part of such functions are periodic. Periodicity is not conceivable without stability, but stability is conceivable without periodicity.

In the process of evolution towards a stable form of movement, Dr. Petzoldt recognizes briefly two factors, "Tendency and Compet.i.tion."[102] Tendency is defined, in general, as the direction, actual or potential, of material parts or of mental or physical function; compet.i.tion, as the conflict of tendencies, from which a tendency of a higher order results. "The concept of Compet.i.tion is, like that of Tendency, to be taken in a general significance. A number of forces which act upon a single point compete. Different mental images, observations, concepts, laws, come into compet.i.tion, from which result concepts and laws of lower and higher orders. The struggle for existence is only a special case of compet.i.tion. Though this often ends with the immediate or gradual destruction of systems entering upon it, nevertheless only a middle worth between all the competing tendencies can be ascribed to the resultant. Even the conqueror is, after the struggle, other than what he was before it; a part of the tendency destroyed by him lives on in him, has combined with his original tendency to a resultant. Tendencies can as little disappear without compensation as can forces, whether the compensation consists in a strengthening or in a weakening of others, and the _conservation of competing tendencies_ might be regarded as a further qualitative addition to the law of the conservation of force. Hence, in the examination of the effects of the struggle for existence, the like claim of all tendencies taking part in it is not to be left out of consideration. Each makes its full force felt. But not all attain to compet.i.tion; of the numerous tendencies bound up in one organism, only a few unite, in the single case, to a resultant, which has a direction towards a definite issue." The less the opposition of competing tendencies of concepts or laws, the less the deviation of the resultant from its components, and the less the change these have to undergo. The higher concepts and laws are, the less are the number of distinguishing marks which they take from all single conceptions; for they are the resultants of very strongly opposed components.[103]

Fechner's views are related to, and, to some extent, dependent upon, certain ones of Zollner adduced in connection with a consideration of sun-spots.[104] Du Prel, who also acknowledges special indebtedness to Zollner, attempted in his "Struggle for Existence in the Heavens" ("Der Kampf ums Dasein am Himmel") to demonstrate the fact of a struggle and selection among the heavenly bodies a.n.a.logous to that claimed for life upon the earth. The t.i.tle of the book was afterwards changed to "The History of the Evolution of the Universe,"[105] its scope having "grown far beyond the limit of the former t.i.tle." Du Prel finds one of the chief advantages of an application of Darwinian ideas to astronomy in the fact that, unlike our earth, the heavens in their immensity afford us existing, or to our eye existing, examples of the various stages of their evolution, in nebular mist, comets, suns, fixed stars, planets, rings, and moons,--all subject to processes of development, which we may to some extent observe. In the first chapter of this book, Du Prel says: "The existing condition of the Cosmos with respect to all forms of the Purposeful[106]--whether we regard the realm of the organic or the inorganic--can be looked upon only as an attained, moving equilibrium of forces. Immanent in Nature lies the capacity to develop from chaotic conditions to teleologic forms; for, in the ceaseless play of forces, all other than such combinations are by their nature given over to destruction, while it lies, on the contrary, in the essence of all purposeful combinations to be preserved. In every system of mechanical forces an adjustment of the same must finally be arrived at through the removal of all immanent oppositions." "_It is impossible_ for nature to remain in chaotic conditions." "Every system of forces tends to a state of equilibrium. This is as true of the conflict of images in a human brain, from whose mutual accommodation the resultant of a unified theory of the universe arises, as of oppositions in the social organism, of the conditions of power and civilization of neighboring peoples, of the meteorologic states of the earth, of the mechanical forces of a solar system, or the atoms of a cosmic mist. Every war of the elements ends with an adjustment of ideal justice, for every 'moment' of force has influence proportioned to its power and the duration of its activity."[107]

There is one portion of Fechner's theory as above stated (its metaphysical phases being beyond the scope of the present chapter have not been touched upon) that raises a question which may perhaps appear to have in itself no special significance, but which nevertheless opens up, by its implications, new fields of inquiry, and may possibly lead to further theory. The condition of stability which evolution in the universe as a whole gradually approaches but can never attain to in finite time is declared, namely, to be one not of rest, but of motion. A question might be raised, here, as to the definition of the "infinite time" a.s.serted to be necessary to the attainment of such full stability,--whether the phrase be used in the mathematical or the philosophic sense; and the question would be found, I believe, to involve the unanswerable problem of the finite or infinite character of the universe in s.p.a.ce. Of a universe conceived under the philosophic concept of spatial infinitude, obviously no final state as the result of evolution can be predicated, the evolution supposing a progress which, as involving infinite matter, cannot be accomplished in finite time. If we, however, conceive the universe as occupying finite s.p.a.ce and undergoing continual evolution as a whole in the direction of equilibrium, it is a question whether the end must not be attained in finite time. For a universe conceived as finite, however immense, there must be a finite number, however great, representing the changes necessary to the attainment of final equilibrium; and if progress in the direction of such equilibrium is of necessity continual, the final equilibrium must be attainable in finite time. The question of the nature of such a state of final, universal stability is bound up with the problem of motion through a perfect void, and of the possibility of the formation of such a void through the concentration of matter.

Leaving out of consideration the problem in its metaphysical form, which concerns the possibility of conceiving inter-material s.p.a.ce, it may be said that it is not now supposed that the heavenly bodies move through an absolute void; and the existence of any medium opposing resistance, however slight, is a condition rendering impossible the attainment of absolute stability of motion or a full stability which suffers no diminution and is, therefore, in effect, an absolute stability. It may be questioned whether the very nature of motion is not coincident with change, and this with action and reaction, or compet.i.tion. Such a view would reduce evolution to a single ultimate principle, in place of Darwin's Variation and Selection through struggle, or Petzoldt's Tendency and Compet.i.tion. We should have left, instead of these, only the final principle involved in moving matter considered in its ultimate parts. The metaphysical problem of the infinite divisibility of matter need not here concern us; the ultimate parts of an organism could not be, however, its organs as Lewes defined them, but rather, from a positive standpoint, the ultimate units recognized by science in cell and cell-parts. We may, indeed, since we know no beginning of motion, legitimately regard all tendency as itself resultant. Just as we cannot separate matter and motion, except by abstraction from reality, so, too, we cannot conceive of motion except as having definite direction; and thus we arrive, by a final a.n.a.lysis, at the ultimate philosophic principles of matter and its motion. I use these terms in no metaphysical sense, but merely as generic terms including under one head specific forms of material combination and the specific forms of motion of their wholes or parts.

The question of the character of a conceived state of final equilibrium may be approached from a somewhat different side, though the emphasis falls, as before, on the solidarity of the universe and the nature of motion as change. We may, for instance, regard the earth as an isolated system whose isolation makes possible the continual progress of the evolution taking place on its surface. But this whole evolution is, on the other hand, dependent upon the light and heat of the sun. Again, the sun is undergoing an evolution whose continuous progress may be regarded as in a certain sense dependent upon isolation; but we see, on reflection, that this very process is the result of the cooling nature of the sun's surroundings, and that it is sending its motion in every direction through s.p.a.ce. The moon, which has pa.s.sed through both the evolution that the sun is undergoing and that which is in progress upon the earth, is now pa.s.sing through another stage which the earth must reach in time by diffusion of its atmosphere, in case its destruction is not accomplished by some catastrophic event before the arrival of that distant period. Suns and planets, all the heavenly bodies, are sending their influence in every direction through the unfathomable depths of s.p.a.ce; and just as the capacity of the earth to be warmed by the influence of the sun involves its reciprocal capacity to act as a cooling medium for that body, so the conditions throughout the universe must be regarded as everywhere interdependent and mutually implying one another. Thus we again arrive finally at a universal action and reaction among the parts of the universe, all motion implying change of the direction of motion. Or, since we may and are, in fact, obliged to regard every direction or form of motion as a resultant,--for of motion as of matter we know no absolute beginning,--even this simple a.s.sumption may supply us with the conclusion which we have reached in a more roundabout way. We may regard motion in any direction as counterbalanced by a resistance in every other direction sufficient to produce it in this one; in other words, motion takes place at every instant, in the direction of least resistance, even though this direction may represent, in the next instant, through the action of new "moments" of force, the greatest resistance. Any direction as well as any change of direction implies, then, resistance; resistance is equivalent to the interference of force, or, in other words, to compet.i.tion; and compet.i.tion may, at any moment, become catastrophe. The difference between compet.i.tion and catastrophe is one merely of degree, or rather it is a subjective difference depending upon the point of view of the observer. In other words, all that we can testify to is a certain periodicity of motion, all motion meeting with resistance, the acc.u.mulation of which finally induces motion in another sense. Larger periodicities are made up of smaller periodicities, and, according to the point of view taken, any period of such motion may be regarded as an evolution, that which Fechner terms "full" stability being only the maximum towards which motion during that period tends. Absolute stability can be conceived only as perfect rest, whether we conceive it as merely an abstraction, its realization as rendered impossible by the conservation of energy, or whether we conceive it as possible in a universe regarded as finite; an absolute stability of motion is a self-contradiction, and a full stability which knows no retrogression is equally a self-contradiction.

Periodicity is, then, all into which the Tendency to Stability resolves itself for nature as we know it.

We perceive, in the actual universe, the fact of a certain imperfect periodicity. This wave form of movement in great and little plays, as Spencer has shown far more elaborately than Fechner, a large part in the universe.

But the evident fact of a present periodicity of imperfect form suggests another possible conception. We are under no necessity to regard the universe as finite either in s.p.a.ce or time. On the contrary. We tend naturally to conceive of it as finite after the a.n.a.logy of particular things which we perceive continually to arise and perish; but as concerns s.p.a.ce, we have no knowledge of any limit, and, as concerns time, the conception of any actual beginning or end to the universe as a whole is only the ancient nave idea which science has disproved in showing that neither matter nor motion ever perish. An infinite universe is conceivable, in which not exactly the same but very similar forms, or forms of which the successive ones closely resemble each other though those widely separated may be very dissimilar, continue to arise and be destroyed to all eternity. The conception of a primal nebular mist is not a necessary inference from astronomic phenomena; it is as easy and as logical to regard the various phases of planetary development revealed to us by the telescope as so many phases of an evolution and dissolution continually recurring in different parts of the universe, one extreme of which is represented by the nebular mist, the other by the cold and lifeless remains of planets gradually suffering dissolution as they revolve through s.p.a.ce. The greater the immensity of the universe is conceived to be, the nearer our conception of it must approach to this type. But the term Tendency to Stability is misapplied when applied to such infinite and imperfect periodicity--to the motion, thus conceived, of the universe as a whole.

The periodicity in the life of organic species may be compared to the wave-motions of light and heat as distinguished from those of water, the individual representing the single wave-length. The a.n.a.logy is not, however, intended--to speak with Bacon--as one of nature, but merely as one of mind. And just here it may be questioned whether Fechner may not have been right, after all, in his a.s.sertion of the dependency of the organism upon periodicity of function, whether the periodic character of the individual life, dependent, as it must be supposed to be, on adaptation to a medium to some degree resisting, does not sacrifice its stability in so far as the increments of resistance lack uniformity.

This is evidently the case in large relations; is it not logically necessary to suppose it so in minute relations, though the fact may not be so evident to the coa.r.s.e measurement of the senses? Experience seems to prove that an approximate periodicity in larger relations, is most consistent with health; and it must be remembered that the non-periodic relations are subordinated to periodic ones, that not only in the case of waking and sleeping, working and eating, but also in those of rest and labor, a certain uniformity is necessary to the best mental and physical condition. A close observation will, I think, reveal a greater periodicity than was at first suspected; since much of it is of so-called "automatic," "unconscious," or "half-conscious" nature. It is to be noticed, here, that the termination of individual lives is often in the nature of a catastrophe, and a uniform periodicity of individual development and decay cannot be a.s.signed, except in the form of an average that falls much below the figure attained by the thoroughly healthy individual. There is every reason to believe that if we could sleep, rise, eat, bathe, exercise, work, and rest with the regularity of a clock, we should be the better for it physically. But the irregularities outside the province of our will-power render it impossible for us to order our lives in this manner. Nor do we desire to do so. For these very irregularities, as representing greater or less change to which adaptation is necessary, are, in many cases and within certain lines, the conditions and signs of progress; though they may const.i.tute in other cases and beyond these lines--that is, where they are of too great intensity or duration--conditions of retrogression, the imperfection in periodicity becoming catastrophe, which may extend beyond the individual to his offspring. We may thus infer that the final destruction of the individual organism is conditioned by its own progress and the progress of its species, but that on the other hand, when the destruction of the individual is too abrupt, it may mean catastrophe to the species also, or at least to a part of it, through heredity.

Our considerations so far have been of a nature to convince us that not isolation, but a constancy in the continual action of like relatively small increments of force in the same directions, is the condition of steady evolution. The less constant and the larger the increments, the nearer the changes involved resemble catastrophe, though the catastrophes themselves may be regarded in another light as forming part of an evolution of a higher order. The changes the sun is undergoing may be regarded as evolution in so far as the influence of the cooling medium is a constant one. The earth as a whole and in its parts may be regarded as pa.s.sing through a process of evolution towards full stability in so far as the sun's heat is a constant quant.i.ty, the periodic changes of seasons and of day and night the same. The relation would seem, therefore, to be one of time--the time-relation involved in the duration of outer conditions as constant with reference to the period required for the attainment of stability. Thus the sun's influence upon the earth might appear approximately constant to the human individual, but might represent a rapid change in relation to some stupendous and long-continued evolution in some other part of the universe. Considerations which we have already noticed forbid our regarding any conditions of "full" as distinguished from absolute stability as anything other than peculiar states single in the system and thus unenduring maxima succeeded by decrease, although the process may be, with reference to any other particular process, so slow, the retrogression from the culminating point so gradual, as to be, with respect to this other process, inappreciable.

And while we are busied with matters which involve the whole multiplicity of relations in the universe, just a word with reference to cause and effect. Which one of these myriad material parts interacting at any moment shall we single out as the cause of the succeeding state? The solidarity of the universe as far as the complete interdependence of all its parts is concerned is clear to us. It is true we cannot reckon with all factors of the universe at once; and the concept of cause and effect is therefore a useful one. But the cause of anything must be, from a positive point of view, just what the methods prescribed for its discovery in any particular case shows it to be: namely, a factor, merely, in the manifold conditions determining a following state, the removal of which means the prevention of the succession of exactly that state. Which, for instance, shall we regard as the cause of an evil act--the character of a man or the temptation offered by circ.u.mstances? The change or removal of either means the change or removal of the act. Neither is complete without the other, and both are involved in the whole complexity of the universe, through heredity on the one hand and the action of nature external to life on the other.

And just here we may glance at Spencer's definition of life as "the continual adjustment of inner relations to outer relations." Though emphasizing an important side of evolution, it is evidently incomplete.

Evolution is not only the adjustment of inner relations to outer relations, it is also the adjustment of outer relations to inner relations as well as of inner relations among themselves; or it is a process of mutual adjustment of all the parts engaged in it.

Our a.n.a.lysis, though crude and imperfect, may now be regarded as complete. Our scope will not allow of a more elaborate one. It is fitting, therefore, that we proceed to synthesis. The first matter which presents itself to us, in this connection, is the theory of Heredity and Adaptation mentioned above.

The theory is not a new one, wholly outside Darwin's conception of evolution. The concept of Adaptation represents simply the generalization of all those special causes with which Darwin more particularly occupied himself, and is, in essence, only a proclamation of that universal subjection to natural law which Darwin himself plainly a.s.serted. As such a. generalization it is, however, a useful one; it furnishes us with an expression, for the organic world, of that universal action and reaction through which opposing forces move towards stability by mutual adjustment.

The law of Heredity, again, may be regarded as an organic expression of the more general principle according to which motion that, in the sense defined above, suffers only a minimum of interference, that is, motion which, by a certain equilibrium of mutual relations, is "approximately"

or "fully" stable, tends to continue to take place in nearly the same directions, or nearly to repeat itself. It is thus apparent, also, that Heredity is closely related to the more special principle of Habit, or also of Use and Disuse, if only we remember that, whatever the metaphysical truths of Freedom or Determination, the psychical is always accompanied by what may be called equivalents of the physical under natural law. The special laws of Heredity are still enveloped in mystery; I refer, not to that mystery which may be regarded as surrounding all ultimate facts, if we choose to conceive them as expressing or concealing something further unknowable, but to the scientific mystery of ignorance, which time may dissolve. Biologists disagree on this question, the ultimate decision of which must be left to them. Still some general criticism on the results of research in this direction may be allowable from a philosophic standpoint.

The chief point at issue between various theories of Heredity seems to be the degree of importance to be attached to Adaptation: however we may express the question, this is the ultimate form to which it is reducible. Now it is obvious, from the foregoing a.n.a.lysis, that the form of theory which would be most useful to us, if such were attainable, would be one in which the degree of tendency to inheritance as well as the strength of inherited tendency is expressed in terms of the intensity and duration of exercise, use, function, habit, or form of motion or action (however we may choose to term it); and variation is regarded as the resultant of such tendency and change in the environment, or, in other words, deviation from constancy of influence.

It may be useful to inquire to what extent such a general theory is authorized by special ones.

We have the testimony of two of the acknowledged greatest authorities--Darwin and Haeckel--as well as that of a score of other biologists, and specialists in related branches, to the inheritance of peculiarities acquired during the life of the individual.[108] Eimer lays especial stress on the fact, long witnessed to by one cla.s.s of specialists, of the hereditary character of brain-diseases, among which may be reckoned some that are without doubt due to direct influence of the environment.[109] Haeckel and Eimer even instance cases in which mutilation has been inherited.[110] One such instance would be sufficient, in overthrowing the general denial of the inheritance of individual adaptation, to make probable the direct influence of the environment in other cases, the uniformity discoverable in the workings of natural law leading us to suppose that the one instance would not be isolated. It must have weight, too, as an argument, in the judgment of many doubtful cases. Not one such case alone is furnished us, however, but many well-authenticated ones. And it is to be remarked that even Weismann has gradually parted from his original theory, recognizing more and more clearly the element of adaptation in inheritance. It seems open to question, indeed, whether Weismann's theory, in withdrawing the germ-plasm from the direct influence of the environment with which the parent individual is in contact does not exempt it from the universal law of action and reaction. Eimer designates such an opposition as Weismann postulates of the germ-plasm to the rest of the organism as a "physiological miracle," and the artificial line thus drawn between the germ-cells before and after the beginning of development as "opposed to that conformity to law shown in the morphological and physiological unity of living beings."[111] Ancient ideas seldom conceived of a universality of action and reaction; and ancient belief, isolating phenomena, invested each with some special guiding power. This belief was maintained as the conception of a special vital force long after the increasing knowledge of nature had caused it to be abandoned with regard to inorganic phenomena; and the theory of the continuity of the germ-plasm seems to be a survival, with regard to the comparatively unexplored province of Embryology, of the idea of such a force.

The elements of which the organism is composed are not strange essences or ent.i.ties peculiar to the organic; they are the same with those of inorganic matter, though their combinations differ somewhat from these, both in chemical composition and in the morphological arrangement of the composites. We can easily conceive these differences as coordinate with differences of general form and function; but it is inconceivable that the continual a.s.similation of matter in growth should be at any time without result in function, however comparatively small this result may be in higher forms representing an acc.u.mulation of energy from previous conditions. The separation of form and function is an abstraction, as is that of matter and motion; we cannot suppose the connection of particular functions with particular forms,--particular organization,--to be accidental, any more than we can suppose the particular properties of particular inorganic composites and elements to be accidental or these particular properties to be without result in the organic matter into which the particular composites and elements are taken up.

The environment must contain complementary conditions of function in order that the individual may even come into existence and survive at all. The great question is, then, how much is to be allowed for original tendency in primal organisms and how much is to be reckoned to the account of the action of the environment in the course of evolution.

Even if we go back beyond the organic, a.s.suming a development of the organic from the inorganic, we must come, in the last a.n.a.lysis, to irresolvable elements whose motion, as distinct and particular action and reaction, must have definite form. If we begin with a supposit.i.tious simple organism conceived as lowest,--the primal form to which the name "organism" may be applied,--we must likewise conceive of this as embodying motion distinctive as its form, which may be regarded as concomitant and coordinate with that form,--or, that is, as function.

The ultimate elements of this organism represent positive factors and the primal organism itself must be regarded as a positive factor (or positive composite) without which the evolution of highest organisms would be impossible. We may, therefore, regard it as in this sense embracing the potentialities of evolution. But are we to regard it as representing potentiality in a further sense--in the sense that, beyond the particular life-motion coordinate with its particular composition and form, it represents an independent force that prefigures the whole animate evolution? To such an a.s.sumption the a.n.a.logy--which is something far more than a mere a.n.a.logy--of Embryology logically reduces us, on Weismann's theory, unless we a.s.sume a fixity of species that practically does away with the whole theory of Evolution and returns to the original darkness that on which Darwin threw light. Or, if we leave out of account this a.n.a.logy and begin with s.e.xual propagation, the problem, on Weismann's theory, is very nearly as difficult. Are we to look upon the conditions involved in the environment as mere negatives and simply developing the positive potentialities of the germ-plasm? If we resolve the environment into its elements, even the ultimate a.n.a.lysis must show it composed of positive factors of matter and motion, each one of which has its full worth in any resultant of incidence. The positivity of these elements takes from the primal germ-plasm any superiority of potentiality; the potentiality lies also in the environment. That the organism is in constant contact with the environment is evident; and that this contact, involving incidence of force, cannot be without result, and result representing a full equivalent of all the factors, is also evident. It may seem as if we could understand human progress, or progress in other species, in the limited province open to direct observation, on Weismann's theory; but evolution as a whole becomes, on this theory, a mystery, and indeed, as Eimer terms it, a miracle.

Logical consistency thus tells against the theory; and undeniable exceptions to its fundamental conception, furnished by such authorities as Darwin and Haeckel, raise a further presumption against it, that, taken in connection with the logical inconsistencies noticed, const.i.tutes the strongest probability against its truth.

The general experience of mankind has recognized, in a thousand ways, that the individual is "a creature of habit." The strength of the muscle, the cunning of hand or eye or ear, mental acuteness, and even liability to temptation in any direction, or, on the other hand, moral strength, all are coincident with exercise within the bounds set by the normal of the organ,--that is, within its ability to repair its waste in labor, an ability defined by the food-supply and its power of a.s.similation; for even the moral struggle that is so great as to exhaust physically ends in a weakness which may represent the very condition of conquest by the temptation opposed, if this present itself again before the system has had time to repair its loss. We may regard this weakness as a lessening of force in one particular direction, the resultant of action deviating in favor of the other of the opposing forces or tendencies manifested in the struggle. In this connection I cannot do better than refer to the "Kritik der reinen Erfahrung" already mentioned, in which the influence of the environment on the individual is minutely traced. The special feature of the work is its entire freedom from the thousand metaphysical implications which have gradually gathered about our philosophical vocabulary and which render it well-nigh impossible to write from any new standpoint without danger of misunderstanding. This perspicuity and exactness are secured by a new vocabulary which may seem at first glance, on account of its unfamiliarity, elaborate and incomprehensible, but which is, when mastered, the greatest possible aid to understanding. Nevertheless, the terminology of the book and the exceeding closeness of its a.n.a.lysis, while rendering it peculiarly valuable to the expert in Philosophy, place it beyond the grasp of the average reader; and Ethics is a science which concerns, not the specialist in Philosophy alone, but all thinking minds.

The influence of exercise even beyond the individual has long been recognized. Lamarck advanced the theory that the development of organs and their force of action is in ratio to their employment. Darwin also laid stress, particularly in his later works, on Use and Disuse, but he often defined the term more specifically than many other authors, Lamarck among them, seem to have done. The very ma.s.s and magnitude of Darwin's knowledge made it, as Huxley has said, somewhat unwieldy, and, in diverting the attention to minute features, sometimes prevented distinctness in broad generalizations; the very virtue of Darwin's work conditioned also its defect. If we begin with the general theory of use and disuse, we may regard each present form of organic action or function, whether conscious or unconscious, as in some manner the result of exercise, the processes of food-taking, digestion, repair of waste, being cla.s.sed, not as, in any case, mere negative reactions, but as positive organic functions. If we apply the term "habit" to all these, it is evident that we must, in so doing, extend the significance of the word beyond its ordinary interpretation. From our present point of view, such an extension of meaning might be claimed to be legitimate; the question here is, in reality, only one of expediency, namely, whether it is not better to retain the more specific significance of the word. It may be useful, at least, to indicate the relations of Habit to Use and Disuse. In its ordinary interpretation, the term "habit" refers more particularly to a form of action acquired during the life of the individual, and may be used to imply the action of the will in its formation, or may simply have in view the organic concomitants of whatever mental action is included in such formation. Since our present standpoint supposes a certain equivalence of the mental and physical, that is, uniformity in their connection (without entering into the question of their dependence or independence, or considering which, in case of dependence, is to be regarded as dependent, which as fundamental and independent), we may leave for the moment the mental side of function out of account, to take it up later. Darwin's definition of habit was, as we have seen, no distinct and invariable one, and while he speaks of "inherited habit," referring both to forms of action acquired during the life of the individual and to such acquired through use favored by constancy of environment during several generations, it is not always plain whether he has in mind the action of the will, or only its organic equivalents. He inclines, like many other authors, to give prominence to the physical side of action in lower species, to the mental side in higher. If we use the term "habit" in the sense of tendency to function acquired by use, we employ what is certainly a useful terminology, yet we are in danger, if we do not carefully define our terms, of elevating to the position of a reality an abstraction that has none. Function and Tendency to Function are not separable; the distinction is not an inner, but an outer one, of favorable or unfavorable environment by which tendency to function becomes function or _vice versa_. To habit, then, we can attach, from our present standpoint, no distinctive implication beyond that of individual acquirement,--an implication obviously not fundamental in a theory of organic function. Use and disuse are rather the fundamental concepts with which, in a consideration of function under Heredity and Adaptation, we have to do.

But, in this connection, it is also obvious that, when we, from our point of view, distinguish between the organism as acted on by the environment and the environment as acting, we make a distinction that may be both useful and necessary for many purposes, but that is yet an arbitrary one. The organism is not the dependent, pa.s.sive, the environment the independent, formative factor in the process of development, the organism is not purely reactive, the environment active, but the two are interactive; and from their interaction arises change, as resultant, in both organism and environment. So, too, if we return to Fechner's conception, the separation of function as effect from use and disuse as cause is an arbitrary one. Every function, as representing a state of more or less perfect, moving equilibrium, may be regarded either as the final form issuing from a long process of action and reaction or, as determined at present, by such a comparative constancy of all its conditions as makes the line followed by the resultant approximately a repet.i.tion of that which it has followed before; and we may lay stress upon either the inferior resistance in this line or the continual application of superior force, the acc.u.mulation of energy, in its direction. Use or exercise is function; long continuance of the same or approximately the same form of function may be regarded as concomitant with a certain constancy of environment, sufficient to furnish the complementary condition always necessary. The present form of function may be regarded as the result of an evolution of function in the sense that it is the end-form a.s.sumed by the same, but not in a sense that separates it from previous forms of function by a distinction of kind; since each of these may be regarded, in like manner, as the result of the preceding evolution. As in the definition of Habit, so in that of Use, the element of animal will or of a distinct vital principle is likely to be consciously or unconsciously included, lending it thus a superior significance to that of mere organic function regarded as its result. Again it must be said, however, that, whatever the metaphysical truth of freedom, will does not interfere with the equivalence of physical conditions and results or prevent perfect uniformity of relation between the physical and the psychical, and that a special vital force cannot be demonstrated. Disuse may be defined either as the mere discontinuance of Use or as Use in a sense opposed to the form of function particularly under consideration.

The idea of some special vital principle doubtless has its origin in the mysterious tendency of every organic form to develop along certain lines. The mystery involved is here, again, besides that of ultimate fact on which the metaphysician lays stress, the lack of the ability of present science to furnish such a description of the process as shall resolve it into its elements and demonstrate the uniformities of relation among these elements in this last a.n.a.lysis. But it is to be remarked that the metaphysician is apt to confuse these two meanings of the word "mystery," and regard the mystery of the organism as a greater metaphysical one than that of simpler processes whose elements are better known; and this in spite of the fact that he himself does not at all deny the uniformity in natural process which we term Law, or expect to find it less in an ultimate a.n.a.lysis than in a more superficial one.

We understand the simple parallelogram by which the physicist represents to us the action of two forces at incidence, we may represent to ourselves the motion of any one of the heavenly bodies as the resultant of the centrifugal and centripetal forces, but when we come to consider the formation of a crystal, and watch the regularity of shape and grouping, this very uniformity which had been before an explanation now seems all at once to represent an insoluble mystery separating the process forever from those others. The more complicated the process becomes, the more the mystery appears to increase, until we build up, out of a negative ignorance, some positive new ent.i.ty to baffle us. And yet neither do we deny, as has been said, the constancy of nature in its most final elements, nor can it at all be shown or supposed that those simpler processes we seemed to understand were less along fixed lines than the more complicated ones. If we grant, then, the insoluble mystery of the transcendental meaning of things claimed by the metaphysician, we cannot admit the presence of this mystery in the organic more than in the inorganic, nor discover in the science of the former any further element lacking than in that of the latter, except a remediable ignorance which, when remedied, can only reveal in new particulars the workings of natural law. It may be remarked, in this connection, that those who are so ready to claim the workings of some special force or power in the development of the organism make no a.s.sertion of such in the so a.n.a.logous growth of the crystal. The pa.s.sage of the inorganic into the organic and back into the inorganic is, in fact, no more (if the metaphysician will, no less) mysterious than the evaporation of water and its recondensation, the propagation of animal form no greater mystery than the continued flowing of a stream in spite of evaporation, or the growth of a crystal to the form of its kind. The propagation of species is, in one sense, an isolated fact; but so, in like sense, is the evaporation of water or the formation of the crystal of a particular chemical: but none of these phenomena are isolated in any other sense, as less or more than a part of a universal whole. We carry our notion of human importance into all our science, and so invest with greater weight and mystery ignorance that concerns our own life and that of allied forms. As we have seen, a connection of use, or of duration and intensity of function, with its strength is evident in the individual, and we are compelled to suppose the connection a constant one even where such constancy cannot be directly demonstrated. There is evidently a relation likewise between degree, or duration and intensity, of use or exercise of function, and strength of tendency in the species, which we must also suppose to be constant. Darwin distinctly recognizes this, everywhere in his work, in a.s.serting that such function as is favored by the environment for several generations is more likely to be transmitted. But though the separation of organism and environment into cause and effect may be useful in the solution of some problems, it is yet to be kept in mind that the distinction is an arbitrary selection of some factors as dependent, others as independent variables, while all are, in fact, interdependent. Function may be regarded as at every moment determined by the factors given in environment and organism, in which either may seem the more important, according to the particular case or the point of view from which it is regarded. The tendency of the organism may represent such an acc.u.mulation of potential energy that a slight favorable element in the environment may be like a spark in a magazine of gunpowder, followed by results seemingly most disproportionate to its own significance; yet the acc.u.mulation of energy in the organism can have taken place only under previous favorable circ.u.mstances of the environment; and if we regard the organism in its relation to the whole environment, that is, to the universal conditions outside it, the primary importance may seem to attach to these. But yet, which is, in the last a.n.a.lysis, the more important to the explosion of the magazine--spark or powder? Either is insufficient without the other; the two are simply complementary and both indispensable to the result.

So too habit, use, or exercise of function and influence of the environment cannot be held distinct; exercise of function is impossible without a sufficient complementary factor in the environment, but this is evidently sufficient only with the existence of that tendency in the organism of which it is the complement. Regarding strong tendency as the result of a long process of evolution in which the environment has presented sufficient complementary elements to condition its development, the strength of tendency being coordinate with the duration and intensity of the process of evolution, we can understand that any such change in the environment as shall prevent such function may be of so much significance, the suppression of the function represent so great departure from what was previous resultant, that even the destruction of the organism may supervene in cases where longest exercised and strongest functions are prevented; and we can understand, from the same standpoint, the slight comparative importance of the experience of individuals as influencing their descendants, except under especially favorable conditions of the organism.

All biologists make much of the mixture of types in s.e.xual propagation; and Rolph, perhaps, lays especial stress on it in connection with progressive heredity. He calls attention to the intricacy of interaction of forces at once introduced by it in its action and reaction with the environment, and shows, in this connection, the extreme similarity of the younger generation to the parent where propagation is non-s.e.xual, that is, does not involve such mixture of types. It may be said that every new factor in development introduces a complexity greater as the complexity of the conditions already attained by the organism is greater, since its influence on the different elements and combinations of elements varies; or (if we choose to put it thus) since the possible chemical compounds and especially the possible combinations and permutations of elements and parts increase enormously with the increase of the latter in number. But the importance of the presence of any particular new element in these complexities depends, further, on its particular nature.

The final decision of the princ.i.p.al question of progressive heredity which our argument concerns must be left to Biology; but biologists themselves have as yet discussed these questions chiefly from a philosophical standpoint,--on general, as distinguished from specific, grounds. All theory is at this point tentative. But if only for this reason we have a right, in a.s.suming a working theory, to select that which seems best to accord with philosophic principles of universal application as well as with general biological fact. For the rest, it has at least been made evident, by all that has been said above concerning the constant contact and interaction of organism and environment, that the selection of one of these two factors as the positive and one as the negative, one as the formative the other as the formed, one as the active the other as the pa.s.sive factor, one as independent the other as dependent, one as invariable the other as alone variable, is an arbitrary one. In dealing with the complexity of the universe, whether mathematically or logically, we cannot grasp all factors at once, and so are obliged to regard some sides to the exclusion of others, to disregard the variable and dependent nature of some factors in the consideration of that of others. The method is useful as well as necessary, useful because necessary; but we are too apt to forget that we are dealing with half-truths, devices of reason, and come to regard them as whole truths. Thus the abstraction of Natural Selection is too often elevated to a separate ent.i.ty, a particular power residing in the environment as such. It is, on the contrary, a mere fiction, a device for a.s.sisting our comprehension of complex action and reaction. Not only does the action of the environment alter the organism, the action of the organism also alters the environment; or, to put it more plainly, the state of organism and environment at any moment is the result of the interaction of preceding states of organism and environment. Material combinations, whether organic or inorganic, when fitted to their environment, survive; those best fitted, where perfect fitness does not exist, thrive best; this is only another method of saying that absence of resistance is coordinate with the preservation of form and its inherent motion to the extent of the non-interference. As organic forms survive only to the extent to which they are in harmony with each other and with inorganic conditions, so inorganic forms or combinations survive unaltered only when they are in harmony with other inorganic conditions and uninterfered with by organic forms. Matter and motion in some form must survive, both being indestructible. Natural Selection in this sense, as at each moment regulating inorganic combinations and motions and organic form and function, is either ultimately the origin of variation, or else it is not its preserver. It is to be remembered that the organism is, from the physical point of view, simply form (that is, organization) and function; when we have subtracted these, we have subtracted the organism.

The inability of the reason to grasp all sides of the complexity of natural processes at once, even where these are known, is a thing to be kept in mind in our future investigations; we are apt to take our a.n.a.lyses for the syntheses of nature.

In the preceding considerations, an "equivalence of the Physical and the Psychical" has been a.s.sumed, which, though already in a measure defined, should have been, perhaps, more fully explained. It may be repeated that, in such equivalence, no materialistic a.s.sumption is made of the dependence of the Psychical on the Physical; nor is the intention to a.s.sert that the Psychical can be measured by the weights and measures of the Physical. The a.s.sertion is intended in the sense that there is always a physical function connected with the psychical, and that the relation of the two is not an accidental or variable, but a constant one. All that is claimed is, in other words, that, whatever the metaphysical truth as to the freedom of the will, such freedom cannot interfere with the constancy of nature. But, in fact, all that is postulated by physical science in the a.s.sertion of the equivalence of physical forces is such a uniformity or constancy of relation as we postulate of the Psychical and Physical; for the different forms of physical force can no more be measured by the same standards than can thought and brain-process.

It may be added, further, that by "force" as used in the above arguments, no metaphysical ent.i.ty is implied; the word simply serves as the generic term embracing different forms of motion and the equivalent of motion in resistance, and enables us to deal with motion regarded as potential as well as with motion actually existent.

FOOTNOTES:

[96] "Problems of Life and Mind," second series, chap. on Evolution.

[97] "The Variation of Plants and Animals under Domestication," 1868, II. 272.

[98] Vol. II. Chap. XXII.

[99] "Variation of Animals and Plants under Domestication," II. p. 257.

See also "Origin of Species," 6th ed., I. pp. 7-9, etc.

[100] "Variation of Animals and Plants under Domestication," II. p. 418.

[101] Ibid.

[102] For elaboration of definition and theory, _vide_ the article in question, "Vierteljahrschrift fur wissenschaftliche Philosophie," 1890.

[103] As confirming this a.n.a.lysis of evolution, reference is made to Mach: "Die Mechanik in ihrer Entwicklungen," p. 128, and "Beitrage zur a.n.a.lyse der Empfindungen," pp. 25, 154; also Avenarius: "Kritik der reinen Erfahrung."

[104] See above essay by Petzoldt.

[105] "Die Entwicklungsgeschichte des Weltalls," 1882.

[106] "Gestaltungen des Zweckma.s.sigen."

[107] "Die Entwicklungsgeschichte des Weltalls," chap. I.