LAMARCK, Jean Baptiste Pierre Antoine de Monet, Chevalier de (1744–1829), a celebrated French naturalist, was born 1st August 1744, at Bazantin, a village of Picardy. He was an eleventh child; and his father, lord of the manor and of old family, but of limited means, having already placed three sons in the army, destined this one for the church, and sent him to the Jesuits at Amiens, where he continued till his father’s death. After this he would remain with the Jesuits no longer, and, not yet seventeen years of age, started for the seat of war at Bergen-op-Zoom, before which place one of his brothers had already been killed. Mounted on an old horse, with a boy from the village as attendant, and furnished by a lady with a letter of introduction to a colonel, he reached his destination on the evening before a battle. Next morning the colonel found that the new and very diminutive volunteer had posted himself in the front rank of a body of grenadiers, and could not be induced to quit the position. In the battle, the company which he had joined became exposed to the fire of the enemy’s artillery, and in the confusion of retreat was forgotten. All the officers and subalterns were killed, and not more than fourteen men were left, when the oldest grenadier seeing there were no more French in sight proposed to the young volunteer so soon become commandant to withdraw his men. This he refused to do without orders. These at last arrived; and for his bravery he was made an officer on the spot, and soon after was named to a lieutenancy.
After the peace, the regiment was sent to Monaco. There it happened that one of his comrades playfully lifted him by the head, and to this it was imputed that he was seized with disease of the glands of the neck, so severe as to necessitate grave surgical interference, and put a stop to his military career.
The courage of Lamarck, so early exhibited, was in future to be shown by the maintenance of his opinions in the absence of any friendly support, and by fortitude amid many adversities; while his activity was to be displayed, not only in manifold speculation, but in copious and varied scientific work. He went to Paris and began the study of medicine, supporting himself by working in a banker’s office. He early became interested in meteorology and in physical and chemical speculations of a chimerical kind, but happily threw his main strength into botany, and in 1778 published his Flore française, a work in which by a dichotomous system of contrasting characters he enabled the student with facility to determine species. This work, which went through several editions and long kept the field, gained for its author immediate popularity as well as the honour of admission to the Academy of Sciences.
In 1781 and 1782, under the title of botanist to the king, an appointment obtained for him by Buffon, whose son accompanied him, he travelled through various countries of Europe, extending his knowledge of natural history; and on his return he began those elaborate contributions to botany on which his reputation in that science principally rests, namely, the Dictionnaire de Botanique and the Illustrations de Genres, voluminous works contributed to the Encyclopédie Méthodique (1785). In 1793, when he was already forty-nine years of age, in consequence of changes in the organization of the natural history department at the Jardin du Roi, where he had held a botanical appointment since 1788, Lamarck was presented to a zoological chair, and called on to lecture on the Insecta and Vermes of Linnæus, the animals for which he introduced the term Invertebrata, still employed. Thus driven, comparatively late in life, to devote his principal attention to zoology instead of botany, he had the misfortune soon after to suffer from impaired vision; and the malady progressing resulted subsequently in total blindness. Yet his greatest zoological work, the Histoire Naturelle des Animaux sans Vertèbres, was published from 1815 to 1822, with the assistance, in the last two volumes, of his eldest daughter and of M. Latreille. A volume of plates of the fossil shells of the neighbourhood of Paris was collected in 1823 from his memoirs in the Annales des Muséum. The later years of his blind old age were spent in straitened circumstances and accumulating infirmities, solaced, however, by the devotion of his family, and particularly of his eldest daughter, of whom Cuvier records that she never left the house from the time that he was confined to his room. He died 18th December 1829.
The character of Lamarck as a naturalist is remarkable alike for its excellences and its defects. His excellences were width of scope, fertility of ideas, and a pre-eminent faculty of precise description, arising not only from a singularly terse style, but from a clear insight into both the distinctive features and the resemblances of forms. That part of his zoological work which still finds a large and important place in the science of the present day, and constitutes his solid claim to the highest honour as a zoologist, is to be found in his extensive and detailed labours in the departments of living and fossil Invertebrata. His endeavours at classification of the great groups were necessarily defective on account of the imperfect knowledge possessed in his time in regard to many of them, e.g., echinoderms, ascidians, and intestinal worms; yet they are not without interest, particularly on account of the comprehensive attempt to unite in one great division as Articulata all those groups that appeared to present a segmented construction. Moreover, Lamarck was the first to distinguish vertebrate from invertebrate animals by the presence of a vertebral column, and among the Invertebrata to found the groups Crustacea, Arachnida, and Annelida. In 1785 (Hist. de l’Acad.) he evinced his appreciation of the necessity of natural orders in botany by an attempt at the classification of plants, interesting, though crude and falling immeasurably short of the system which grew in the hands of his intimate friend Jussieu. The problem of taxonomy has never been put more philosophically than he subsequently put it in his Animaux sans Vertèbres:—“What arrangement must be given to the general distribution of animals to make it conformable to the order of nature in the production of these beings?”
The most prominent defect in Lamarck must be admitted, quite apart from all consideration of the famous hypothesis which bears his name, to have been want of control in speculation. Doubtless the speculative tendency furnished a powerful incentive to work, but it outran the legitimate deductions from observation, and led him into the production of volumes of worthless chemistry without experimental basis, as well as into spending much time on fruitless meteorological predictions. His Annuaires Météorologiques were published yearly from 1800 to 1810, and were not discontinued until after an unnecessarily public and brutal tirade from Napoleon, administered on the occasion of being presented with one of his works on natural history.
