The Columbia Encyclopedia, Sixth Edition. 2001-07.
Bütschli, Otto
(ô´t büch´l) (KEY) , 18481920, German zoologist. He was professor of zoology at the Univ. of Heidelberg. His researches on invertebrate animals advanced knowledge of the development of gastropods, insects, and other forms; the structure of nematode worms; and processes of division of the nucleus and cell. A significant contribution was his theory (1878) of the structure of protoplasm, which suggested that it is alveolar or foamlike; he helped to establish that it is fluid in nature.