The biological problem of today: preformation or epigenesis? : The basis of a theory of organic development / by Oscar Hertwig.

  • Oscar Hertwig
Date:
1896
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Licence: Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)

Credit: The biological problem of today: preformation or epigenesis? : The basis of a theory of organic development / by Oscar Hertwig. Source: Wellcome Collection.

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