Diagram of the composition of the germ-plasm in hybrids, fig. 22 in chapter 'The Phenomena of Reversion', p. 303 The Germ-Plasm: A Theory of Heredity by August Weismann, London, Walter Scott, 1893

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Credit: Diagram of the composition of the germ-plasm in hybrids, fig. 22 in chapter 'The Phenomena of Reversion', p. 303 The Germ-Plasm: A Theory of Heredity by August Weismann, London, Walter Scott, 1893. Wellcome Collection. Source: Wellcome Collection.