Public Domain Mark
You can use this work for any purpose without restriction under copyright law. Read more about this licence.
Credit
Diagram of different generations of idants, Fig. 19 in chapter on 'Effects of Amphimixis on the Germ-Plasm', p. 239 of The Germ-Plasm: A Theory of Heredity by August Weismann, London, Walter Scott, 1893. Wellcome Collection. Public Domain Mark. Source: Wellcome Collection.