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[21] _Ibid._, p. 24.
[22] _Outlines of the Economic History of England_ (London, 1908), p. 118.
[23] _Growth of Eng. Ind. and Commerce_ (Cambridge, 1892), p. 180.
[24] _England's Industrial Development_ (London, 1912), p. 247.
[25] _English Economic History_ (New York, 1893), part ii, p. 262.
[26] Carew, _Survey of Cornwall_ (London, 1814), p. 77.
[27] Cunningham, _Growth of English Industry and Commerce, Modern Times_, 1903, part i, p. 101.
[28] Lennard, _Rural Northamptonshire_ (Oxford, 1916), p. 87. For other examples, _cf. infra_, pp. 84, 99-101.
[29] Leonard, _Royal Hist. Soc. Trans._, 1905. Gonner in _Common Land and Inclosure_ covers much the same ground, but does not bring out as clearly the extent to which the seventeenth century enclosures were accompanied by conversion of tilled land to pasture.
[30] Tawney, _Agrarian Problem in the Sixteenth Cen._ (London, 1912), p.
391.
[31] _Royal Hist. Soc. Trans._ (1905), vol xix, note 1, p. 113.
[32] _Ibid._, pp. 116-117.
[33] Rogers, _History of Agriculture and Prices_, vol. iv, p. 757.
[34] _Cf. infra_, p. 98.
[35] Levett and Ballard, _The Black Death_, p. 129.
[36] _Cf. infra_, p. 82.
[37] Tawney, _op. cit._, p. 220, note 1.
[38] _Infra_, p. 78, 81, 98-9.
CHAPTER II
THE FERTILITY OF THE COMMON FIELDS
Up to this point attention has been given chiefly to the theory that the enclosure movement waxed and waned in response to supposed fluctuations in the relative prices of wool and grain, and it has been found that this theory is untenable. It is now necessary to consider more closely the true cause of the conversion of arable land to pasture--the declining productivity of the soil--and the cause of the restoration of this land to cultivation--the restoration of its fertility.
The connection between soil fertility and the system of husbandry has been explained by Dr. Russell, of the Rothamsted Experiment Station:
Virgin land covered with its native vegetation appears to alter very little and very slowly in composition. Plants spring up, a.s.similate the soil nitrates, phosphates, pota.s.sium salts, etc., and make considerable quant.i.ties of nitrogenous and other organic compounds: then they die and all this material is added to the soil. Nitrogen-fixing bacteria also add to the stores of nitrogen compounds. But, on the other hand, there are losses: some of the added substances are dissipated as gas by the decomposition bacteria, others are washed away in the drainage water. These losses are small in poor soils, but they become greater in rich soils, and they set a limit beyond which acc.u.mulation of material cannot go. Thus a virgin soil does not become indefinitely rich in nitrogenous and other organic compounds, but reaches an equilibrium level where the annual gains are offset by the annual losses so that no net change results. This equilibrium level depends on the composition of the soil, its position, the climate, etc, and it undergoes a change if any of these factors alter. But for practical purposes it may be regarded as fairly stationary.
When, however, the virgin soil is broken up by the plough and brought into cultivation the native vegetation and the crop are alike removed, and therefore the sources of gain are considerably reduced. The losses, on the other hand, are much intensified.
Rain water more readily penetrates, carrying dissolved substances with it: biochemical decompositions also proceed. In consequence the soil becomes poorer, and finally it is reduced to the same level as the rate of gain of nitrogenous matter. A new and lower equilibrium level is now reached about which the composition of the soil remains fairly constant; this is determined by the same factors as the first, _i. e._ the composition of the soil, climate, etc.
Thus each soil may vary in composition and therefore in fertility between two limits: a higher limit if it is kept permanently covered with vegetation such as gra.s.s, and a lower limit if it is kept permanently under the plough. These limits are set by the nature of the soil and the climate, but the cultivator can attain any level he likes between them simply by changing his mode of husbandry. The lower equilibrium level is spoken of as the inherent fertility of the soil because it represents the part of the fertility due to the soil and its surroundings, whilst the level actually reached in any particular case is called its condition or "heart", the land being in "good heart "or "bad heart", according as the cultivator has pushed the actual level up or not; this part of the fertility is due to the cultivator's efforts.
The difference between the higher and lower fertility level is not wholly a question of percentage of nitrogen, carbon, etc. At its highest level the soil possesses a good physical texture owing to the flocculation of the clay and the arrangement of the particles: it can readily be got into the fine tilth needed for a seed bed. But when it has run down the texture becomes very unsatisfactory. Much calcium carbonate is also lost during the process: and when this const.i.tuent falls too low, the soil becomes "sour" and unsuited for crops.
The simplest system of husbandry is that of continuous wheat cultivation, practiced under modern conditions in new countries.
When the virgin land is first broken up its fertility is high; so long as it remains under cultivation this level can no longer be maintained, but rapidly runs down. During this degradation process considerable quant.i.ties of plant food become available and a succession of crops can be raised without any subst.i.tution of manure ... After a time the unstable period is over and the new equilibrium level is reached at which the soil will stop if the old husbandry continues. In this final state the soil is often not fertile enough to allow of the profitable raising of crops; it is now starving for want of those very nutrients that were so prodigally dissipated in the first days of its cultivation, and the cultivator starves with it or moves on.
Fortunately recovery is by no means impossible, though it may be prolonged. It is only necessary to leave the land covered with vegetation for a period of years when it will once again regain much of the nitrogenous organic matter it has lost.[39]
Dr. Russell adds that soil-exhaustion is essentially a modern phenomenon, however, and gives the following reasons for supposing that the medieval system conserved the fertility of the soil. First, the cattle grazed over a wide area and the arable land all received some dung. Thus elements of fertility were transferred from the pasture land to the smaller area of tilled land. This process, he admits, involved the impoverishment of the pasture land, but only very slowly, and the fertility of the arable was in the meanwhile maintained. Secondly, the processes of liming and marling the soil were known, and by these means the necessary calcium carbonate was supplied. Thirdly, although there was insufficient replacement of the phosphates taken from the soil, the yield of wheat was so low that the amount of phosphoric acid removed was small, and the system was permanent for all practical purposes. One of the facts given in substantiation of this view is that the yield after enclosure increased considerably.[40]
In discussing these points, it will be well to begin with the evidence as to exhaustion afforded by the increased yield under enclosure. The improvement in yield took place because of the long period of fallow obtained when the land was used as pasture; or, in the eighteenth century, with the increase in nitrogenous organic matter made possible when hay and turnips were introduced as field forage crops. That is, the increase in yield depended either upon that prolonged period of recuperation which will _restore fertility_, or upon an actual increase in the amount of manure used. Apparently, then, open-field land had become exhausted, since an increase in yield could be obtained by giving it a rest, without improving the methods of cultivation, etc., or by adding more manure.
There was not, as Dr. Russell supposes, enough manure under the medieval system of husbandry to maintain the fertility of the soil. It is true that the husbandman understood the value of manure, and took care that the land should receive as much as possible, and that he knew also of the value of lime and marl. But, as Dr. Simkhovitch says:
It is not within our province to go into agrotechnical details and describe what the medieval farmer knew, but seldom practiced for lack of time and poor means of communication, in the way of liming sour clay ground, etc. Plant production is determined by the one of the necessary elements that is available in the least quant.i.ty. It is a matter of record that the medieval farmer had not enough and could not have quite enough manure, to maintain the productivity of the soil.[41]
The knowledge of the means of maintaining and increasing the productivity of the soil is one thing, but the ability to use this knowledge is another. The very origin and persistence of the c.u.mbersome common-field system in so many parts of the world is sufficient testimony as to the impossibility of improving the quality of the soil in the Middle Ages. The only way in which these men could divide the land into portions of equal value was to divide it first into plots of different qualities and then to give a share in each of these plots to each member of the community. They never dreamed of being able to bring the poor plots up to a high level of productivity by the use of plentiful manuring, etc., but had to accept the differences in quality as they found them. The inconvenience and confusion of the common-field system were endured because, under the circ.u.mstances, it was the only possible system.
Very few cattle were kept. No more were kept because there was no way of keeping them. In the fields wheat, rye, oats, barley and beans were raised, but no hay and no turnips. Field gra.s.ses and clover which could be introduced in the course of field crops were unknown. What hay they had came entirely from the permanent meadows, the low-lying land bordering the banks of streams. "Meadow gra.s.s," writes Dr.
Simkhovitch, "could grow only in very definite places on low and moist land that followed as a rule the course of a stream. This gave the meadow a monopolistic value, which it lost after the introduction of gra.s.s and clover in the rotation of crops."[42] The number of cattle and sheep kept by the community was limited by the amount of forage available for winter feeding. Often no limitation upon the number pastured in summer in the common pastures was necessary other than that no man should exceed the number which he was able to keep during the winter. The meadow hay was supplemented by such poor fodder as straw and the loppings of trees, and the cattle were got through the winter with the smallest amount of forage which would keep them alive, but even with this economy it was impossible to keep a sufficient number.
The amount of stall manure produced in the winter was of course small, on account of the scant feed, and even the more plentiful manure of the summer months was the property of the lord, so that the villain holdings received practically no dung. The villains were required to send their cattle and sheep at night to a fold which was moved at frequent intervals over the demesne land, and their own land received ordinarily no dressing of manure excepting the scant amount produced when the village flocks pastured on the fallow fields.
The supply of manure, insufficient in any case to maintain the fertility of the arable land, was diminishing rather than increasing.
As Dr. Russell suggested in the pa.s.sage referred to above, the continuous use of pastures and meadows causes a deterioration in their quality. The quant.i.ty of fodder was decreasing for this reason, almost imperceptibly, but none the less seriously. Fewer cattle could be kept as the gra.s.s land deteriorated, and the small quant.i.ty of manure which was available for restoring the productivity of the open fields was gradually decreasing for this reason.
Soil exhaustion went on during the Middle Ages not because the cultivators were careless or ignorant of the fact that manure is needed to maintain fertility, but because this means of improving the soil was not within their reach. They used what manure they had and marled the soil when they had the time and could afford it, but, as the centuries pa.s.sed, the virgin richness of the soil was exhausted and crops diminished.
The only crops which are a matter of statistical record are those raised on the demesne land of those manors managed for their owners by bailiffs who made reports of the number of acres sown and the size of the harvest. These crops were probably greater than those reaped from average land, as it is reasonable to suppose that the demesne land was superior to that held by villains in the first place, and as it received better care, having the benefit of the sheep fold and of such stall manure as could be collected. Even if it were possible to form an accurate estimate of the average yield of demesne land, then, we should have an over-estimate for the average yield of ordinary common-field land. No accurate estimate of the average yield even of demesne land can be made, however, on the basis of the few entries regarding the yield of land which have been printed. Variations in yield from season to season and from manor to manor in the same season are so great that nothing can be inferred as to the general average in any one season, nor as to the comparative productivity in different periods, from the materials at hand. For instance, at Downton, one of the Winchester manors, the average yield of wheat between 1346 and 1353 was 6.5 bushels per acre, but this average includes a yield of 3.5 bushels in 1347 and one of 14 bushels in 1352,[43] showing that no single year gives a fair indication of the average yield of the period. For the most part the data available apply to areas too small and to periods too brief to give more than the general impression that the yield of land was very low.
In the thirteenth century Walter of Henley and the writer of the anonymous _Husbandry_ are authorities for the opinion that the average yield of wheat land should be about ten bushels per acre.[44] At Combe, Oxfordshire, about the middle of the century, the average yield during several seasons was only 5 bushels.[45] About 1300, the fifty acres of demesne planted with wheat at Forncett yielded about five-fold or 10 bushels an acre (five seasons).[46] Between 1330 and 1340, the average yield (500 acres for three seasons), at ten manors of the Merton College estates was also 10 bushels.[47] At Hawsted, where about 60 acres annually were sown with wheat, the average yield for three seasons at the end of the fourteenth century was a little more than 7-1/2 bushels an acre.[48]
Statistical data so scattered as this cannot be used as the basis of an inquiry into the rate of soil exhaustion. Where the normal variation from place to place and from season to season is as great as it is in agriculture, the material from which averages are constructed must be unusually extensive. So far as I know, no material in this field entirely satisfactory for statistical purposes is accessible at the present time. There is, however, one manor, Witney, for which important data for as many as eighteen seasons between 1200 and 1400 have been printed. A second suggestive source of information is Gras's table of harvest statistics for the whole Winchester group of manors, covering three different seasons, separated from each other by intervals of about a century. The acreage reported for the Winchester manors is so extensive that the average yield of the group can be fairly taken to be the average for all of that part of England.
Moreover, Witney seems to be representative of the Winchester group, if the fact that the yield at Witney is close to the group average in the years when this is known can be relied upon as an indication of its representativeness in the years when the group average is not known. The average yield for all the manors in 1208-1209 was 4-1/3 bushels per acre; for Witney alone, 3-2/3. In 1396-1397 the yield of the group and the yield at Witney are, respectively, 6 and 6-1/4 bushels per acre.[49]
Table III shows the yield of wheat on the manors of the Bishopric of Winchester in the years 1209, 1300 and 1397. If it could be shown that these were representative years, we should have a means of measuring the increase or decrease in productivity in these two centuries. Some indication of the representativeness of the years 1300 and 1397 is given by a comparison of prices for these years with the average prices of the period in which they lie. The price in 1300 was about 17 per cent below the average for the period 1291-1310,[50] an indication that the crop of nine bushels per acre reaped in 1299-1300 was above the normal. The price of wheat in 1397 was very slightly above the average for the period;[51] six bushels an acre or more, then, was probably a normal crop at the end of the fourteenth century. This conclusion is supported also by the fact that the yield in that year at Witney was approximately the same as the average of the eleven seasons between 1340 and 1354 noted in Table V. The price of wheat in the year 1209-1210 is not ascertainable. Walter of Henley's statement that the price of corn must be higher than the average to prevent loss when the return for seed sown was only three-fold[52] is an indication that the normal yield must have been at this time at least three-fold, or six bushels, so that the extremely low yield of the year 1208-1209 can hardly be considered typical. This examination of the yield in the three seasons shown in the table gives these results: at the beginning of the thirteenth century the average yield was probably about six bushels and certainly not more than ten; at the beginning of the fourteenth century the average was less than nine bushels--how much less, whether more or less than six bushels, is not known--at the end of the fourteenth century the yield was about six bushels.
TABLE III
YIELD OF WHEAT ON THE MANORS OF THE BISHIPRIC OF WINCHESTER[53]
_Area sown_ _Produce_ _Ratio produce_ _Date_ _Acres_ _Bushels per acre_ _to seed_