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The profession of arms had not led Lamarck to forget the principles of physical science which he had received at college. During his sojourn at Monaco the singular vegetation of that rocky country had attracted his attention, and Chomel’s Traité des Plantes usuelles accidentally falling into his hands had given him some smattering of botany.

Lodged at Paris, as he has himself said, in a room much higher up than he could have wished, the clouds, almost the only objects to be seen from his windows, interested him by their ever-changing shapes, and inspired in him his first ideas of meteorology. There were not wanting other objects to excite interest in a mind which had always been remarkably active and original. He then realized, to quote from his biographer, Cuvier, what Voltaire said of Condorcet, that solid enduring discoveries can shed a lustre quite different from that of a commander of a company of infantry. He resolved to study some profession. This last resolution was but little less courageous than the first. Reduced to a pension (pension alimentaire) of only 400 francs a year, he attempted to study medicine, and while waiting until he had the time to give to the necessary studies, he worked in the dreary office of a bank.

The meditations, the thoughts and aspirations of a contemplative nature like his, in his hours of work or leisure, in some degree consoled the budding philosopher during this period of uncongenial labor, and when he did have an opportunity of communicating his ideas to his friends, of discussing them, of defending them against objection, the hardships of his workaday life were for the time forgotten. In his ardor for science all the uncongenial experiences of his life as a bank clerk vanished. Like many another rising genius in art, literature, or science, his zeal for knowledge and investigation in those days of grinding poverty fed the fires of his genius, and this was the light which throughout his long poverty-stricken life shed a golden lustre on his toilsome existence. He did not then know that the great Linné, the father of the science he was to illuminate and so greatly to expand, also began life in extreme poverty, and eked out his scanty livelihood by mending over again for his own use the cast-off shoes of his fellow-students. (Cuvier.)

Bourguin[10] tells us that Lamarck’s medical course lasted four years, and this period of severe study—for he must have made it such—evidently laid the best possible foundation that Paris could then afford for his after studies. He seems, however, to have wavered in his intentions of making medicine his life work, for he possessed a decided taste for music. His eldest brother, the Chevalier de Bazentin, strongly opposed, and induced him to abandon this project, though not without difficulty.

At about this time the two brothers lived in a quiet village[11] near Paris, and there for a year they studied together science and history. And now happened an event which proved to be the turning point, or rather gave a new and lasting impetus to Lamarck’s career and decided his vocation in life. In one of their walks they met the philosopher and sentimentalist, Jean Jacques Rousseau. We know little about Lamarck’s acquaintance with this genius, for all the details of his life, both in his early and later years, are pitifully scanty. Lamarck, however, had attended at the Jardin du Roi a botanical course, and now, having by good fortune met Rousseau, he probably improved the acquaintance, and, found by Rousseau to be a congenial spirit, he was soon invited to accompany him in his herborizations.

Still more recently Professor Giard[12] has unearthed from the works of Rousseau the following statement by him regarding species: “Est-ce qu’à proprement parler il n’existerait point d’espèces dans la nature, mais seulement des individus?”[13] In his Discours sur l’Inégalité parmi les Hommes is the following passage, which shows, as Giard says, that Rousseau perfectly understood the influence of the milieu and of wants on the organism; and this brilliant writer seems to have been the first to suggest natural selection, though only in the case of man, when he says that the weaker in Sparta were eliminated in order that the superior and stronger of the race might survive and be maintained.

“Accustomed from infancy to the severity of the weather and the rigors of the seasons, trained to undergo fatigue, and obliged to defend naked and without arms their life and their prey against ferocious beasts, or to escape them by flight, the men acquired an almost invariably robust temperament; the infants, bringing into the world the strong constitution of their fathers, and strengthening themselves by the same kind of exercise as produced it, have thus acquired all the vigor of which the human species is capable. Nature uses them precisely as did the law of Sparta the children of her citizens. She rendered strong and robust those with a good constitution, and destroyed all the others. Our societies differ in this respect, where the state, in rendering the children burdensome to the father, indirectly kills them before birth.”[14]

Soon Lamarck abandoned not only a military career, but also music, medicine, and the bank, and devoted himself exclusively to science. He was now twenty-four years old, and, becoming a student of botany under Bernard de Jussieu, for ten years gave unremitting attention to this science, and especially to a study of the French flora.

Cuvier states that the Flore Française appeared after “six months of unremitting labor.” However this may be, the results of over nine preceding years of study, gathered together, written, and printed within the brief period of half a year, was no hasty tour de force, but a well-matured, solid work which for many years remained a standard one.

It brought him immediate fame. It appeared at a fortunate epoch. The example of Rousseau and the general enthusiasm he inspired had made the study of flowers very popular—“une science à la mode,” as Cuvier says—even among many ladies and in the world of fashion, so that the new work of Lamarck, though published in three octavo volumes, had a rapid success.

The preface was written by Daubenton.[15] Buffon also took much interest in the work, opposing as it did the artificial system of Linné, for whom he had, for other reasons, no great degree of affection. He obtained the privilege of having the work published at the royal printing office at the expense of the government, and the total proceeds of the sale of the volumes were given to the author. This elaborate work at once placed young Lamarck in the front rank of botanists, and now the first and greatest honor of his life came to him. The young lieutenant, disappointed in a military advancement, won his spurs in the field of science. A place in botany had become vacant at the Academy of Sciences, and M. de Lamarck having been presented in the second rank (en seconde ligne), the ministry, a thing almost unexampled, caused him to be given by the king, in 1779, the preference over M. Descemet, whose name was presented before his, in the first rank, and who since then, and during a long life, never could recover the place which he unjustly lost.[16] “In a word, the poor officer, so neglected since the peace, obtained at one stroke the good fortune, always very rare, and especially so at that time, of being both the recipient of the favor of the Court and of the public.”[17]

A. de Vaux-Bidon, del. From an old engraving

LAMARCK AT THE AGE OF 35 YEARS

The interest and affection felt for him by Buffon were of advantage to him in another way. Desiring to have his son, whom he had planned to be his successor as Intendant of the Royal Garden, and who had just finished his studies, enjoy the advantage of travel in foreign lands, Buffon proposed to Lamarck to go with him as a guide and friend; and, not wishing him to appear as a mere teacher, he procured for him, in 1781, a commission as Royal Botanist, charged with visiting the foreign botanical gardens and museums, and of placing them in communication with those of Paris. His travels extended through portions of the years 1781 and 1782.

According to his own statement,[18] in pursuit of this object he collected not only rare and interesting plants which were wanting in the Royal Garden, but also minerals and other objects of natural history new to the Museum. He went to Holland, Germany, Hungary, etc., visiting universities, botanical gardens, and museums of natural history. He examined the mines of the Hartz in Hanover, of Freyburg in Saxony, of Chemnitz and of Cremnitz in Hungary, making there numerous observations which he incorporated in his work on physics, and sent collections of ores, minerals, and seeds to Paris. He also made the acquaintance of the botanists Gleditsch at Berlin, Jacquin at Vienna, and Murray at Göttingen. He obtained some idea of the magnificent establishments in these countries devoted to botany, “and which,” he says, “ours do not yet approach, in spite of all that had been done for them during the last thirty years.”[19]

On his return, as he writes, he devoted all his energies and time to research and to carrying out his great enterprises in botany; as he stated: “Indeed, for the last ten years my works have obliged me to keep in constant activity a great number of artists, such as draughtsmen, engravers, and printers.”[20]

But the favor of Buffon, powerful as his influence was,[21] together with the aid of the minister, did not avail to give Lamarck a permanent salaried position. Soon after his return from his travels, however, M. d’Angiviller, the successor of Buffon as Intendant of the Royal Garden, who was related to Lamarck’s family, created for him the position of keeper of the herbarium of the Royal Garden, with the paltry salary of 1,000 francs.

According to the same État, Lamarck had now been attached to the Royal Garden five years. In 1789 he received as salary only 1,000 livres or francs; in 1792 it was raised to the sum of 1,800 livres.