Felix Dujardin, a French naturalist, born in Tours, April 5, 1801, died April 8, 1860. He was the son of a poor watchmaker, and was dependent on his own exertions for his education. From 1827 to 1834 he had charge of the public course of lectures in Tours on geometry and chemistry as applied to the arts. In the latter year he went to Paris to prepare a geological description of Touraine, but was persuaded by Dutrochet to turn his attention to zoology. He devoted himself chiefly to investigations among the infusoria, and arrived at conclusions which led him to oppose the theories of Ehrenberg and to make a new classification. In 1839 he was appointed professor of mineralogy at Toulouse, and afterward of botany and zoology at Rennes. His principal works are: Observations sur les rhizopodes (1835); Promenades d'un naturaliste (1837); Histoire naturelle des zoophytes infusoires (1841); Manuel complet de l' observateur au microscope (1842); and Histoire naturelle des helminthes (1844). He left unfinished a work entitled Histoire naturelle des zoophytes echi-nodermes, which was edited and published by ' M. Hupe in 1861. He founded in 1839 a scientific journal entitled Hermes.