The topic # 13. O. Butschli.

I need in the references (see below) and full name for this description:

1891 O. Bütschli (full name? YYYY-YYYY ?) developed a theory of the foam-cell structure of the protoplasm. He designed models of protoplasm from various substances. He prepared most thin foams and achieved a great skill by succeeding in a really tremendous external resemblance of the foam clumps with cells. His foams that he prepared by saponification of various oils continues moving, sometimes for several days.[...]

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