SAINT HILAIRE, Augustin Francois Cesar Prouvencal de, French botanist, born in Orleans, France, 4 .Oct., 1799; died there, 30 September, 1853. He was sent when a young man to Holland to superintend a sugar-refinery that belonged to the family, and he thus passed several years in an uncongenial employment. On his return to France he devoted himself enthusiastically to the study of natural history, his favorite science, and, refusing the appointment of auditor of the counsel of the state, he embarked for Rio Janeiro on 1 April, 1816. For six years he explored the Brazilian empire, journeying about 5,600 miles from 13. south latitude to the Rio de la Plata, . He returned to France in 1822 with 24,000 specimens of plants, embracing about 6,000 species, almost all of them new, and nearlv all analyzed on the spot, grains, 2,000 birds, 16,00{) insects, and 135 quadrupeds, besides reptiles, fishes, and a few minerals. On reaching home he devoted himself at once to preparation for publication of his elaborate work on the flora of Brazil; but his health, seriously impaired by the fatigues and trials he had undergone, gave way, and it was only after a long period of rest that he was enabled to complete it. He was appointed correspondent of the institute in 1819 while absent in Brazil, and became an active member after the death of Chevalier Jean Lamarck, 8 February. 1830. He was also a chevalier of the Legion of honor, and of the Portuguese Order of Christ. Among his works are "Apergu d'un voyage dans l'intdrieur du Brdsil, la province Cisplatine et les missions du Paraguay" (Paris, 1823); "Flora Brasiliae meridionalis, ou his-toire et description de routes les plantes qui trois-sent dans les diff6rentes provinces du Brdsil" (3 vols., 1825)" "3idmoire sur le syst5me d'agriculture adopt6 par les Brdsiliens et les rdsultats qu'il a eus dans la province de Minas-Oeraes" (1827); "Voyage dans la province de Rio de Janeiro et Minas-Oeraes" (2 vols., 1830): "Voyage dans le district des diamants et sur le littoral du Brdsil" (2 vols., 1833): and "Voyage aux sources du San Francisco et dans la province de Govaz" (2 vols., 1847-'8).