doctor of physic, professor of botany in the Royal Garden at Paris, and a member of the Académie des Sciences, was born at Lyons in the year 1686, and educated at Montpellier, where he took his degree of doctor of physic, after which he became associated with the faculty of Paris. Although much occupied in the practice of medicine in the capital, he was ardently devoted to the study of botany, having, in the earlier part of his life, visited Spain and the southern provinces of France in search of plants. When stationary at Paris, he communicated various essays to the academy, which are printed in its Mémoires. These are chiefly botanical, illustrating the characters or the qualities of various exotics, at that period not well known; but he has given several papers also, on extraneous fossils, and a few other subjects of natural history. He furnished the two Appendices to Tournefort's Institutiones Rei Herbariae, and edited the Icones of Barrelier. He also published an historical account of the magnificent collection of drawings of plants and animals, originally begun under the auspices of Gaston duke of Orleans, and continued down to the present times. When Linnæus visited Paris in 1738, he, in a letter to Haller, mentioned the elder Jussieu, as "much engaged in medical practice, well versed in the knowledge of the species of plants, though too prone to multiply them, and strictly confined to the ideas and principles of Tournefort." In one important point, however, which could hardly escape Linnæus, and ought not to be forgotten, he emancipated himself from the errors of his master, for he perfectly understood, and fully admitted, the doctrine of the sexes of plants. A letter of his, completely explaining this phenomenon on the most correct principles, is given by Bradley, in his Philosophical Account of the Works of Nature (p. 25-32). He died of an apoplectic fit, at Paris, on the 22d of April 1758, aged seventy-two.