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.
CHICAGO
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