History of Civilization in England, Vol. 2 of 3

by Henry Thomas Buckle

From the preceding summary of the progress of physical knowledge, the reader may form some idea of the ability of those eminent men who arose in France during the latter half of the eighteenth century. To complete the picture, it is only necessary to examine what was done in the two remaining branches of natural history, namely, botany and mineralogy, in both of which the first great steps towards raising each study to a science were taken by Frenchmen a few years before the Revolution.

In botany, although our knowledge of particular facts has, during the last hundred years, rapidly increased,[1120] we are only possessed of two generalizations wide enough to be called laws of nature. The first generalization concerns the structure of plants; the other concerns their physiology. That concerning their physiology is the beautiful morphological law, according to which the different appearance of the various organs arises from arrested development: the stamens, pistils, corolla, calyx, and bracts being simple modifications or successive stages of the leaf. This is one of many valuable discoveries we owe to Germany; it being made by Göthe late in the eighteenth century.[1121] With its importance every botanist is familiar; while to the historian of the human mind it is peculiarly interesting, as strengthening that great doctrine of development, towards which the highest branches of knowledge are now hastening, and which, in the present century, has been also carried into one of the most difficult departments of animal physiology.[1122]

But the most comprehensive truth with which we are acquainted respecting plants, is that which includes the whole of their general structure; and this we learnt from those great Frenchmen who, in the latter half of the eighteenth century, began to study the external world. The first steps were taken directly after the middle of the century, by Adanson, Duhamel de Monceau, and, above all, Desfontaines; three eminent thinkers, who proved the practicability of a natural method hitherto unknown, and of which even Ray himself had only a faint perception.[1123] This, by weakening the influence of the artificial system of Linnæus,[1124] prepared the way for an innovation more complete than has been effected in any other branch of knowledge. In the very year in which the Revolution occurred, Jussieu put forward a series of botanical generalizations, of which the most important are all intimately connected, and still remain the highest this department of inquiry has reached.[1125] Among these, I need only mention the three vast propositions which are now admitted to form the basis of vegetable anatomy. The first is, that the vegetable kingdom, in its whole extent, is composed of plants either with one cotyledon, or with two cotyledons, or else with no cotyledon at all. The second proposition is, that this classification, so far from being artificial, is strictly natural; since it is a law of nature, that plants having one cotyledon are endogenous, and grow by additions made to the centre of their stems, while, on the other hand, plants having two cotyledons are exogenous, and are compelled to grow by additions made, not to the centre of their stems, but to the circumference.[1126] The third proposition is, that when plants grow at their centre, the arrangement of the fruit and leaves is threefold; when, however, they grow at the circumference, it is nearly always fivefold.[1127]

This is what was effected by the Frenchmen of the eighteenth century for the vegetable kingdom:[1128] and if we now turn to the mineral kingdom, we shall find that our obligations to them are equally great. The study of minerals is the most imperfect of the three branches of natural history, because, notwithstanding its apparent simplicity, and the immense number of experiments which have been made, the true method of investigation has not yet been ascertained; it being doubtful whether mineralogy ought to be subordinated to the laws of chemistry, or to those of crystallography, or whether both sets of laws will have to be considered.[1129] At all events it is certain that, down to the present time, chemistry has shown itself unable to reduce mineralogical phenomena; nor has any chemist, possessing sufficient powers of generalization, attempted the task except Berzelius; and most of his conclusions were overthrown by the splendid discovery of isomorphism, for which, as is well known, we are indebted to Mitscherlich, one of the many great thinkers Germany has produced.[1130]

Although the chemical department of mineralogy is in an unformed and indeed anarchical condition, its other department, namely, crystallography, has made great progress; and here again the earliest steps were taken by two Frenchmen, who lived in the latter half of the eighteenth century. About 1760, Romé De Lisle[1131] set the first example of studying crystals, according to a scheme so large as to include all the varieties of their primary forms, and to account for their irregularities, and the apparent caprice with which they were arranged. In this investigation he was guided by the fundamental assumption, that what is called an irregularity, is in truth perfectly regular, and that the operations of nature are invariable.[1132] Scarcely had this great idea been applied to the almost innumerable forms into which minerals crystallize, when it was followed up with still larger resources by Haüy, another eminent Frenchman.[1133] This remarkable man achieved a complete union between mineralogy and geometry; and, bringing the laws of space to bear on the molecular arrangements of matter, he was able to penetrate into the intimate structure of crystals.[1134] By this means, he succeeded in proving that the secondary forms of all crystals are derived from their primary forms by a regular process of decrement;[1135] and that, when a substance is passing from a liquid to a solid state, its particles are compelled to cohere, according to a scheme which provides for every possible change, since it includes even those subsequent layers which alter the ordinary type of the crystal, by disturbing its natural symmetry.[1136] To ascertain that such violations of symmetry are susceptible of mathematical calculation, was to make a vast addition to our knowledge; but what seems to me still more important is, that it indicates an approach to the magnificent idea, that every thing which occurs is regulated by law, and that confusion and disorder are impossible.[1137] For, by proving that even the most uncouth and singular forms of minerals are the natural results of their antecedents, Haüy laid the foundation of what may be called the pathology of the inorganic world. However paradoxical such a notion may seem, it is certain that symmetry is to crystals what health is to animals; so that an irregularity of shape in the first, corresponds with an appearance of disease in the second.[1138] When, therefore, the minds of men became familiarized with the great truth, that in the mineral kingdom there is, properly speaking, no irregularity, it became more easy for them to grasp the still higher truth, that the same principle holds good of the animal kingdom, although, from the superior complexity of the phenomena, it will be long before we can arrive at an equal demonstration. But, that such a demonstration is possible, is the principle upon which the future progress of all organic, and indeed of all mental science, depends. And it is very observable, that the same generation which established the fact, that the apparent aberrations presented by minerals are strictly regular, also took the first steps towards establishing the far higher fact, that the aberrations of the human mind are governed by laws as unfailing as those which determine the condition of inert matter. The examination of this would lead to a digression foreign to my present design; but I may mention that, at the end of the century, there was written in France the celebrated treatise on insanity, by Pinel; a work remarkable in many respects, but chiefly in this, that in it the old notions respecting the mysterious and inscrutable character of mental disease are altogether discarded:[1139] the disease itself is considered as a phenomenon inevitably occurring under certain given conditions, and the foundation laid for supplying another link in that vast chain of evidence which connects the material with the immaterial, and thus uniting mind and matter into a single study, is now preparing the way for some generalization, which, being common to both, shall serve as a centre round which the disjointed fragments of our knowledge may safely rally.

These were the views which, during the latter half of the eighteenth century, began to dawn upon French thinkers. The extraordinary ability and success with which these eminent men cultivated their respective sciences, I have traced at a length greater that I had intended, but still very inadequate to the importance of the subject. Enough, however, has been brought forward, to convince the reader of the truth of the proposition I wished to prove; namely, that the intellect of France was, during the latter half of the eighteenth century, concentrated upon the external world with unprecedented zeal, and thus aided that vast movement, of which the Revolution itself was merely a single consequence. The intimate connexion between scientific progress and social rebellion, is evident from the fact, that both are suggested by the same yearning after improvement, the same dissatisfaction with what has been previously done, the same restless, prying, insubordinate, and audacious spirit. But in France this general analogy was strengthened by the curious circumstances I have already noticed, by virtue of which, the activity of the country was, during the first half of the century, directed against the church rather than against the state; so that in order to complete the antecedents of the Revolution, it was necessary that, in the latter half of the century, the ground of attack should be shifted. This is precisely what was done by the wonderful impetus given to every branch of natural science. For, the attention of men being thus steadily fixed upon the external world, the internal fell into neglect; while, as the external corresponds to the state, and the internal to the church, it was part of the same intellectual development, that the assailers of the existing fabric should turn against political abuses the energy which the preceding generation had reserved for religious ones.

Thus it was that the French Revolution, like every great revolution the world has yet seen, was preceded by a complete change in the habits and associations of the national intellect. But besides this, there was also taking place, precisely at the same time, a vast social movement, which was intimately connected with the intellectual movement, and indeed formed part of it, in so far as it was followed by similar results and produced by similar causes. The nature of this social revolution I shall examine only very briefly, because in a future volume it will be necessary to trace its history minutely, in order to illustrate the slighter but still remarkable changes which in the same period were going on in English society.

In France, before the Revolution, the people, though always very social, were also very exclusive. The upper classes, protected by an imaginary superiority, looked with scorn upon those whose birth or titles were unequal to their own. The class immediately below them copied and communicated their example, and every order in society endeavoured to find some fanciful distinction which should guard them from the contamination of their inferiors. The only three real sources of superiority,—the superiority of morals, of intellect, and of knowledge,—were entirely overlooked in this absurd scheme; and men became accustomed to pride themselves not on any essential difference, but on those inferior matters, which, with extremely few exceptions, are the result of accident, and therefore no test of merit.[1140]

The first great blow to this state of things, was the unprecedented impulse given to the cultivation of physical science. Those vast discoveries which were being made, not only stimulated the intellect of thinking men, but even roused the curiosity of the more thoughtless parts of society. The lectures of chemists, of geologists, of mineralogists, and of physiologists, were attended by those who came to wonder, as well as by those who came to learn. In Paris, the scientific assemblages were crowded to overflowing.[1141] The halls and amphitheatres in which the great truths of nature were expounded, were no longer able to hold their audience, and in several instances it was found necessary to enlarge them.[1142] The sittings of the Academy, instead of being confined to a few solitary scholars, were frequented by every one whose rank or influence enabled them to secure a place.[1143] Even women of fashion, forgetting their usual frivolity, hastened to hear discussions on the composition of a mineral, on the discovery of a new salt, on the structure of plants, on the organization of animals, on the properties of the electric fluid.[1144] A sudden craving after knowledge seemed to have smitten every rank. The largest and the most difficult inquiries found favour in the eyes of those whose fathers had hardly heard the names of the sciences to which they belonged. The brilliant imagination of Buffon made geology suddenly popular; the same thing was effected for chemistry by the eloquence of Fourcroy, and for electricity by Nollet; while the admirable expositions of Lalande caused astronomy itself to be generally cultivated. In a word, it is enough to say, that during the thirty years preceding the Revolution, the spread of physical science was so rapid, that in its favour the old classical studies were despised;[1145] it was considered the essential basis of a good education, and some slight acquaintance with it was deemed necessary for every class, except those who were obliged to support themselves by their daily labour.[1146]