Bibliography

In connection with each chapter, wherever this is possible, there are four classes of references. First is named a small and inexpensive but satisfactory book on the subject. Second, a more comprehensive book, readily accessible and not unduly expensive. Then a few of the most satisfactory reference books on the subject independent of cost or ready availability. Fourth, a list of references to articles in the eleventh edition of the Encyclopedia Britannica.

[Chapter I]. Evolution before Darwin.

[Chapter II]. Darwin and Wallace.

[Chapter III]. The Underlying Idea.

[Chapter IV]. Adaptation for the Individual.