DUJARDIN, FELIX (18oI-186o), French biologist, was born at Tours on April 5, 18o1, and died at Rennes on April 8, 186o. He forsook his early training in art and engineering for natural science, from 1843 concentrating on microscopic work in zoology. In 1840 he became dean of Rennes university, but two years later resigned to become a professor. In 1835 he dis tinguished protoplasm from other viscid substances, designating it "sarcode" and assigning to it all the qualities of life. He made de tailed studies of rhizopods which he had discovered in 18J4, and of oceanic foraminifera. Besides a manual of microscopic observa tion, he wrote Natural History of In f usoria .