Abstract
DARWIN assumed that species originate by the gradual accumulation of infinitesimal, ordinarily invisible variations on account of their utility in the struggle for life. The difficulties inherent in this conception have led to the theory of mutation, which supposes that the production of species and varieties proceeds by small but distinct steps, each step corresponding to one or more unit-characters. It is only after their appearance that the environment can decide about their utility.
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DE VRIES, H. The Present Position of the Mutation Theory. Nature 104, 213–214 (1919). https://doi.org/10.1038/104213a0
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DOI: https://doi.org/10.1038/104213a0
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