Species and Varieties
Their Origin by Mutation

Lectures delivered at the University of California

By
Hugo DeVries
Professor of Botany in the University of Amsterdam

Edited by
Daniel Trembly MacDougal
Director Department of Botanical Research
Carnegie Institution of Washington

Second Edition
Corrected and Revised


CHICAGO
The Open Court Publishing Company
LONDON
Kegan Paul, Trench, Trubner and Co., Ltd.
1906

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COPYRIGHT 1904
BY
The Open Court Pub. Co.