Transcriber's Notes

This version of the e-book uses some unicode symbols. If the following characters do not appear, then you may need to select a Unicode font type in your browser:

⇆ (left arrow over right arrow)
α β γ λ ν π υ (Greek characters)
♀ ♂ (female and male)

Uncommon forms for chemical names have been retained where they occur in the text, e.g. "atropin" for "atropine"; "asparagin" for "asparagine", etc. The spellings of "Sidot blend" and "Sidot blende" are used interchangeably in the text.

Some inconsistencies in formatting and punctuation have been retained from the original. "PH" or P_H (P subscript H) is retained as used in the text for the scale of alkali-acidity where the more familiar modern usage is "pH". Molar concentrations are indicated in various ways (lower case m, italic lower case m, small capital m): the formats are retained as in the original.

Changes to the text have been made only in the case of obvious spelling or type-setting errors. These are listed at [the end of the book].

[PREFACE]
[CONTENTS]
[BIBLIOGRAPHY]
[INDEX]

Monographs On Experimental Biology

EDITED BY

JACQUES LOEB, Rockefeller Institute
T. H. MORGAN, Columbia University
W. J. V. OSTERHOUT, Harvard University