Famous Men of Science Part 7

His study of the variable stars attracted wide attention. He found that the star _Mira Ceti_ was for several months invisible to the naked eye; then it grew brighter and brighter, and finally disappeared for months, as before. He saw that other stars are periodic, and came to the conclusion that this is occasioned by the rotation of the star upon its axis, by which different parts of its surface are presented to us periodically.

He made a catalogue of double stars, and found by laborious calculations that such stars have a common centre of gravity; that one sun revolves about another. He found that our solar system has a motion of its own; a grand orbit round some as yet unknown centre, and that other systems have a like motion.

What this centre may be, whether a great sun like Sirius, one hundred times larger than ours, with unknown powers and unknown uses, is of course only conjecture.

Herschel gave much attention to nebulae, discovering and describing twenty-five hundred new nebulae and cl.u.s.ters. He gave his life to the study of the construction of the heavens. Concerning his statement of the general construction, Professor Holden, himself a brilliant astronomer, says: "It is the groundwork upon which we have still to build.... As a scientific conception it is perhaps the grandest that has ever entered into the human mind. As a study of the height to which the efforts of one man may go, it is almost without a parallel.... As a practical astronomer he remains without an equal. In profound philosophy he has few superiors. By a kindly chance he can be claimed as the citizen of no one country. In very truth his is one of the few names which belong to the whole world."

The distinguished man, though una.s.suming and gentle in manner, must have had a realizing sense of the greatness of his work, for he said, "I have looked further into s.p.a.ce than ever human being did before me. I have observed stars of which the light takes _two millions_ of years to travel to this globe."

He gave much study to light and heat. So boundless was his knowledge believed to be, that a farmer called one day to ask the proper time for cutting his gra.s.s.

"Look at that field," said the scientist, "and when I tell you it is mine, I think you will not need another proof to convince you that I am no more weatherwise than yourself or the rest of my neighbors."

He worked earnestly till he was seventy-six, always depending upon his faithful and inseparable Caroline for aid in his labors. He made a telescope for her, with which she swept the heavens for comets, finding eight, five of which she discovered for the first time.

At seventy-six his health began to fail. He had worked incessantly from his struggling boyhood, but brain work does not wear us out; care and anxiety bring the marks of age upon us. He now took little journeys away from Slough for change of scene and air, while Caroline stayed at home to copy his papers for the Royal Society, and to arrange his ma.n.u.scripts. In 1816, he was made a knight of the Royal Hanoverian Guelphic Order, by the Prince Regent, and in 1821 was the first president of the Royal Astronomical Society, his son being its first foreign secretary.

In February, 1818, Caroline spent twelve precious days with her brother, "not in idleness," she says, "but in sorrow and sadness. He is not only unwell, but low in spirits." Later he went to Bath with Lady Herschel.

"The last moments before he stepped into the carriage," says the loving Caroline, "were spent in walking with me through his library and workrooms, pointing with anxious looks to every shelf and drawer, desiring me to examine all and to make memorandums of them as well as I could. He was hardly able to support himself, and his spirits were so low, that I found difficulty in commanding my voice so far as to give him the a.s.surance he should find on his return that my time had not been misspent.

"When I was left alone I found that I had no easy task to perform, for there were packets of writings to be examined which had not been looked at for the last forty years. But I did not pa.s.s a single day without working in the library as long as I could read a letter without candle-light, and taking with me papers to copy, etc., which employed me for the _best part of the night_, and thus I was enabled to give my brother a clear account of what had been done at his return."

On the 4th of July, 1819, Herschel sent a note to his dear co-worker.

"Lina,--There is a great comet. I want you to a.s.sist me. Come to dine and spend the day here. If you can come soon after one o'clock we shall have time to prepare maps and telescopes. I saw its situation last night,--it has a long tail."

Caroline wrote on this small slip of yellow paper: "I keep this as a relic! Every line _now_ traced by the hand of my dear brother becomes a treasure to me."

Every day hereafter she spent the forenoon with Sir William. On the 15th of August she went as usual and found that he was confined to his room.

"I flew there immediately," she says. "As soon as he saw me, I was sent to the library to fetch one of his last papers and a plate of the forty-foot telescope. But for the universe I could not have looked twice at what I had s.n.a.t.c.hed from the shelf, and when he faintly asked if the breaking up of the Milky Way was in it, I said 'Yes!' and he looked content. I cannot help remembering this circ.u.mstance, it was the last time I was sent to the library on such an occasion. That the anxious care for his papers and workroom never ended but with his life was proved by his frequent whispered inquiries if they were locked and the key safe, of which I took care to a.s.sure him that they were, and the key in Lady Herschel's hands.

"After half an hour's vain attempt to support himself, my brother was obliged to consent to be put to bed, leaving no hope ever to see him rise again. For ten days and nights we remained in the most heart-rending situation till the 25th of August, when not one comfort was left to me but that of retiring to the chamber of death, there to ruminate without interruption on my isolated situation. Of this last solace I was robbed on the 7th of September, when the dear remains were consigned to the grave."

Faithful and devoted watcher over his dead body, to the last! When he had been buried in the little church at Upton, Windsor, at the age of eighty-four, honored by all Europe and America, Caroline could live no longer where remembrance of him made it intolerable.

She went back to Hanover, "a person," she said, sadly, "that has nothing more to do in this world," to live with her brother Dietrich. She had come to England, a girl of twenty-two; she went back an elderly woman, seventy-two. The home in Germany did not prove a happy one, but how could it without William? She lived simply, not spending half of the five hundred dollars a year left her by her dead brother.

She had already published "A Catalogue of eight hundred and sixty Stars, observed by Flamsteed, but not included in the British Catalogue," and "A General Index of Reference to every Observation of every star in the above mentioned British Catalogue." She also prepared "The Reduction and Arrangement, in the form of a Catalogue in Zones, of all the Star Cl.u.s.ters and Nebulae observed by Sir William Herschel in his Sweeps," "a work," said Sir David Brewster, "of immense labor; an extraordinary monument of the unextinguished ardor of a lady of seventy-five in the cause of abstract science."

For this the Royal Astronomical Society voted her the gold medal, and gave her the unusual distinction of honorary membership.

Sixteen years after her return to Hanover, Sir John Herschel, her nephew, who had made his wonderful review of the southern heavens, discovering as many new nebulae as his father, took his only boy, Willie, to see her.

She was now eighty-eight. The visit was overwhelming to her affectionate heart. She watched the child with the most intense delight. Fearing the results if she knew the time of their departure for England, Sir John, with mistaken kindness, went away at four o'clock in the morning, without saying good-by. But the anguish of separation was thereby rendered greater.

The years went by slowly. On her ninety-sixth birthday the King of Prussia sent her a gold medal, Alexander von Humboldt writing her a letter from Berlin to accompany it.

January 14, 1848, at the age of almost ninety-eight, Caroline Herschel died, and was buried from the same garrison church where nearly a century before she had been christened. In her coffin was placed, by her desire, a lock of her brother's hair. Beautiful affection! great co-workers in their immortal study of unnumbered worlds!

ALEXANDER VON HUMBOLDT.

[Ill.u.s.tration: ALEXANDER VON HUMBOLDT.]

The great Aga.s.siz, in his eloquent address, in Boston, on the hundredth anniversary of the birth of Humboldt, said: "All the fundamental facts of popular education in physical science, beyond the merest elementary instruction, we owe to him. We are reaping daily in every school throughout the broad land, where education is the heritage of the poorest child, the intellectual harvest sown by him.

"There is not a text-book of geography, or a school atlas in the hands of our children to-day, which does not bear, however blurred and defaced, the impress of his great mind. But for him our geographies would be mere enumerations of localities and statistics. He first suggested the graphic methods of representing natural phenomena which are now universally adopted. The first geological sections, the first sections across an entire continent, the first averages of climate ill.u.s.trated by lines, were his. Every school-boy is familiar with his methods now, but he does not know that Humboldt is his teacher...."

Naturally we ask how such a man rose to fame, and what incited him to stand among the few intellectual leaders of the world.

Frederick William Henry _Alexander_ von Humboldt was born September 14, 1769, in Berlin, the same year as Baron Cuvier. Unlike Cuvier, he came into a home of wealth and culture. His father was a Prussian officer and chamberlain to the king. His mother, the widow of Baron von Hollwede, married Major von Humboldt when he was forty-six years old, bringing into the family much landed property. Three children were born to them, a daughter who died in infancy, and the famous brothers, William and Alexander, the former two years older than the latter.

The father, an exceedingly amiable and benevolent man, died when Alexander was but ten years old. The mother, left with her two sons, was wise enough to select superior tutors for them, deeming a good education their best preparation for a useful life.

Much of their time was spent at their summer home at Tegel, on the banks of the Havel, about eight miles from Berlin. In 1778 Goethe went there for a visit, and the two Humboldt lads, nine and eleven years of age, played and talked with the leading mind of Germany.

The children were not altogether happy there, as Alexander wrote a friend years afterward. "Vine-clad hills which here we call mountains, extensive plantations of foreign trees, the meadows surrounding the house, and lovely views of the lake with its picturesque banks awaiting the beholder at every turn, render this place undoubtedly one of the most attractive residences in the neighborhood. If, in addition, you picture to yourself the high degree of luxury and taste that reigns in our home, you will indeed be surprised when I tell you that I never visit this place without a certain feeling of melancholy.... I pa.s.sed most of that unhappy time (my youthful days) here at Tegel, among people who loved me, and showed me kindness, but with whom I had not the least sympathy, where I was subjected to a thousand restraints and much self-imposed solitude, and where I was often placed in circ.u.mstances that obliged me to maintain a close reserve, and to make continual self-sacrifices.

"Now that I am my own master, and living here without restraint, I am unable to yield myself to the charms of which nature is here so prodigal, because I am met at every turn by painful recollections of my childhood, which even the inanimate objects around me are continually awakening. Sad as such recollections are, however, they are interesting from the thought that it was just my residence here which exercised so powerful an influence in the formation of my character and the direction of my tastes to the study of nature."

Much which seems trying and unsatisfactory is, after all, our best discipline for life. The strongest and n.o.blest characters are not developed in the perpetual sunshine of happiness. Rain and sun are alike necessary for growth.

Alexander early showed great fondness for natural history, collecting flowers, plants, b.u.t.terflies, sh.e.l.ls, and stones, so that he was called the "Little Apothecary." He likewise found great delight in drawing. He says of himself: "Until I reached the age of sixteen, I showed little inclination for scientific pursuits. I was of a restless disposition, and wished to be a soldier. This choice was displeasing to my family, who were desirous that I should devote myself to the study of finance, so that I had no opportunity of attending a course of botany or chemistry; I am self-taught in almost all the sciences with which I am now so occupied, and I acquired them comparatively late in life. Of the science of botany I never so much as heard till I formed the acquaintance in 1788 of Herr Willdenow, a youth of my own age, who had just been publishing a Flora of Berlin. His gentle and amiable character stimulated the interest I felt in his pursuits. I never received any lessons professedly, but I used to bring him the specimens I collected, and he gave me their cla.s.sifications. I became pa.s.sionately devoted to botany, and took especial interest in the study of cryptogamia. The sight of exotic plants, even when only as dried specimens in an herbarium, fired my imagination with the pleasure that would be derived from the view of a tropical vegetation in southern lands."

At sixteen, then, the boy did not know for what he was best fitted in life. How important for young men and women to study themselves, and know their own tastes and capacities! At nineteen he had never heard of botany, and yet he became one of the most distinguished of botanists!

The boy also longed to go to sea, not an unusual desire in restless and ambitious natures. But he was frail in body, and gave little evidence that he would ever be able to accomplish any of the things for which he longed.

At nineteen he was ready for college, and with his brother entered at Frankfort-on-the-Oder. He gave his time largely to finance and political economy, by his mother's desire, that he might be able to act in some capacity under the government.

At college, as ever after in life, he found one devoted friend, who became his inseparable companion. At Frankfort, it was Wegener, a young theologian, with a warm heart, and great zeal for knowledge. Nor did this friendship cease when he went to Gottingen some months later, for better opportunities in the study of science. He wrote to Wegener: "If G.o.d only spare us, nothing can break the bond between two friends who are to each other more than brothers.... My fervent love and sincere friendship for you are as imperishable as the soul which gives them birth.... How happy, how inexpressibly happy should I be, if I had a friend like you by my side!... I doubt not that among eight hundred men there must be some with whom I could form a friendship, but how long is it often before we find each other out! Were not you and I acquainted for three months before we discovered how completely we were made one for the other? To be without a friend, what an existence! And where can I hope to find a friend whom I could place by your side in my affections!"

These words seem like those of a lover, or an affectionate woman, but they come from a mind that now, as in after years, towered like a giant oak in the trees of a forest. Beautiful union of brain and heart! Such only makes an ideal character.

Humboldt had already met Willdenow, and begun to love botany. Again he writes to Wegener: "I have just come in from a solitary walk in the Thiergarten,"--he was for a short time in Berlin,--"where I have been seeking for mosses, lichens, and fungi, which are just now in perfection. How sad to wander about alone! And yet there is something attractive in this solitude, when occupied with nature.... I am collecting materials for a work on the various properties of plants, medicinal properties excepted; it is a work requiring such great research, and such a profound knowledge of botany, as to be far beyond my una.s.sisted powers, and I am therefore endeavoring to enlist the cooperation of several of my friends.... Pray do not imagine that I am going to appear as an author forthwith; I do not intend that shall happen for the next ten years, and by that time I trust I shall have discovered something startlingly new and important."

Gottingen was now at the height of its glory. Humboldt attended courses of lectures on archaeology, on trade and commerce, on light, heat, and electricity, on agriculture, and on ancient tragic poets, under Heyne, of whom he said, "Heyne is undoubtedly the man to whom this century is the most deeply indebted; to him we owe the spread of religious enlightenment, by means of the education and training he has inst.i.tuted for young village school-masters; to him is due the introduction of a more liberal tone of thought, the establishment of a literary archaeology, and the first a.s.sociation of the principles of aesthetics with the study of philology."

Humboldt was also fond of Greek. He said, "The more I know of the Greek language, the more am I confirmed in my preconceived opinion, that it is the true foundation for all the higher branches of learning."

With some friends, he soon founded the Philosophical Society, which, with the admirable libraries and museums at hand, became of great a.s.sistance to the students.

The next year, 1790, he had become so interested in science, that he wrote Wegener: "I was away from Gottingen for two months, spending the vacation in making a scientific tour with a Herr van Genns, a Dutchman with whom I became acquainted through his writings on botanical subjects.... Amid the numberless distractions of the journey, which was made sometimes on foot and sometimes by carriage, and with the incessant occupation of packing up minerals and plants, I was not very well able to write to you." The result of this tour was a pamphlet, "Mineralogical Observations on some Basalts of the Rhine." His next works were two small treatises, "The Aqueous Origin of Basalt," and "The Metallic Seams in the Basalt at Unkel." And this youth of twenty-one was self-taught both in mineralogy and geology!

The wonder was not so great, perhaps, that a young man of his age should have written these sketches, as that, being wealthy and of the best social position, the temptations to ease and enjoyment did not draw him away from such subjects. Poverty may not be a delight, but the larger part of the world's work has been done under its stimulus. Wealth should be an incentive, because it gives leisure for careful study, but this is not always the case.

At Gottingen, Humboldt found a friend among the eight hundred. At the house of Heyne he made the acquaintance of George Foster, Heyne's son-in-law, a man who exerted a remarkable and lasting influence over him. Foster was thirty-six; Humboldt, fifteen years his junior. He had been around the world with Captain Cook in his second voyage, and had published an able book upon the subject. He was skilled in chemistry, philosophy, literature, and politics, understood Latin, Greek, French, English, Dutch, and Italian, and was somewhat conversant with the Swedish, Spanish, Portuguese, Russian, and Polish languages.