Species and Varieties
Their Origin by Mutation
Lectures delivered at the University of
Professor of Botany in the University of Amsterdam
Daniel Trembly MacDougal
Director Department of Botanical Research
Carnegie Institution of Washington
Corrected and Revised
The Open Court Publishing Company
Kegan Paul, Trench, Trubner and Co., Ltd.
The Open Court Pub. Co.
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THE ORIGIN OF SPECIES
The origin of species is a natural phenomenon.