Bütschli, Otto

Bütschli, Otto ô´tō büch´lē [key], 1848–1920, 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.

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