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Richard von Hertwig, German zoologist

Richard von Hertwig, German zoologist

C028/6435

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Credit

AMERICAN PHILOSOPHICAL SOCIETY / SCIENCE PHOTO LIBRARY AMERICAN PHILOSOPHICAL SOCIETY / SCIENCE PHOTO LIBRARY

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Editorial use only.

Caption

Richard von Hertwig (1850-1937), German zoologist. Hertwig is best know, along with this brother Oscar, for the development of germ layer theory. This was the idea that all the tissues in an organism develop from primary germ layers.

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