brother Antoine, he could not be induced to succeed him in his office, but prevailed upon L. G. Lemonnier to assume the higher position. He died in Paris on 6 November 1777. Joseph de Jussieu (1704–1779), brother of Antoine and Bernard, was born in Lyon on 3 September 1704. Educated like the rest of the family for the medical profession, he accompanied C. M. de la Condamine to Peru, in the expedition for measuring an arc of the meridian, and remained in South America for thirty-six years, returning to France in 1771. Amongst the seeds he sent to his brother Bernard were those of Heliotropium arborescens, then first introduced into Europe. He died in Paris on 11 April 1779. Antoine Laurent de Jussieu (1748–1836), nephew of the three preceding, was born in Lyon on 12 April 1748. Called to Paris by his uncle Bernard, and carefully trained by him for the pursuits of medicine and botany, he largely profited by the opportunities afforded him. Gifted with a tenacious memory, and the power of quickly grasping the salient points of subjects under observation, he steadily worked at the improvement of that system of plant arrangement which had been sketched out by his uncle. In 1789 was issued his Genera piantarum secundum ordines naturales disposita, juxta methodum in horto regio Parisiensi exaratam. This volume formed the basis of modern classification; more than this, it is certain that Georges Cuvier derived much help in his zoological classification from its perusal. Hardly had the last sheet passed through the press, when the French Revolution broke out, and the author was installed in charge of the hospitals of Paris. The Museum d'histoire naturelle was organized on its present footing mainly by him in 1793, and he selected for its library everything relating to natural history from the vast materials obtained from the convents then broken up. He continued as professor of botany there from 1770 to 1826, when his son Adrien succeeded him. Besides the Genera, he produced nearly sixty memoirs on botanical topics. He died in Paris on 17 September 1836. Adrien-Henri de Jussieu (1797–1853), son of Antoine Laurent, was born in Paris on 23 December 1797. He displayed the qualities of his family in his thesis for the degree of M.D., De Euphorbiacearum generibus medicisque earundem viribus tentamen, Paris, 1824. He was also the author of valuable contributions to botanical literature on the