Présentation de l'éditeur :
November and December, 1910, before the Lowell I nstitute, Boston, as well as. on a course of five lectures delivered before the Graduate School of Agriculture held under the auspices of the Association of Agricultural Colleges and Experiment Stations at A mes, I owa, in July, 1910. The hope is entertained that it may be of service to students and that it will also interest the general reader. The writer wishes to express his gratitude to the Carnegie Institution of Washington for permission, in its preparation, to draw freely upon published and unpublished material derived from investigations aided by the I nstitution. Acknowledgment is also due to the following persons, or to their publishers, for permission to use figures from their publications, as indicated in the text: Prof. E. B. Wilson and The Macmillan Co., Prof. H. S. Jennings and The American Naturalist, Dr. W. B. Kirkham and The American Book Co. W. E.
(Typographical errors above are due to OCR software and don't occur in the book.)
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