August Weismann investigated heredity and argued for distinguishing changes transmitted through the reproductive lineage from changes acquired by the rest of the body. His essays helped frame questions about the relationship between biological development and inherited variation. The collected essays record stages in his changing views, so their arguments should be read with their individual dates rather than treated as a single unchanging theory.[ref]
Figure 1.
Portrait of August Weismann
. Unknown photographer; reproduced with Edwin G. Conklin’s 1915 memorial in Proceedings of the American Philosophical Society 54(220), iii–xii. Public domain in the United States; Commons cites expired copyright for the historical publication. Source usage terms, via Wikimedia Commons. Source.

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