“ In 1852 he began to study medicine and natural science at Berlin, where he was greatly influenced by J. Müller and C. G. Ehrenberg, the former being at that period engaged in his important researches on the Echinoderms. In 1855 he accompanied Müller to Norway, and there spent two months on a desolate reef that he might obtain satisfactory observations. The latter part of his stay at Berlin he devoted, along with J. Lachmann, to the study of the Infusoria and Rhizopods. In 1857 he obtained the degree of doctor, and in 1862 he was chosen professor of comparative anatomy at Geneva. ”