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"The production of form from formlessness in the egg-derived individual, the multiplication of parts and the orderly creation of diversity among them, is an actual evolution, of which anyone may ascertain the facts, but of which no one has dissipated the mystery in any significant measure. This microevolution forms an integral part of the grand evolution problem and lies at the base of it, so that we shall have to understand the minor process before we can thoroughly comprehend the more general one. Morphogenetics, therefore, is a field in which the evolutionists must work." (Leavitt 1909: 30, esiletõst lisatud siin.)
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- Leavitt, Robert Greenleaf 1909. A vegetative mutant, and the principle of homoeosis in plants. Botanical Gazette 47(1): 30–68.vt
- Philiptschenko, Juri 1927. Variabilität und Variation. Berlin: Gebrüder Bornträger.