Excerpt from Principles of Economic Zoology
The authors have long felt the need of one book in the hands of the student which would give not only the salient facts of structural Zoology and the development of the various branches of animals, but also such facts of natural history or the life and habits of animals as to show the interrelations of structure, habit, and environment. For we believe that a knowledge of both structure and life-history is necessary before any suggestions or discoveries can be made concerning the principles which underlie and control all animal life, including that of man. For it is principles and their application for which we are searching.
This book is an attempt to supply this need. It is especially designed to accompany the Field and Laboratory Guide (Part I).
For the sake of the natural history many examples have been included. To reduce the size of the book it has been necessary to print this natural history in smaller type, but that in no way implies that it is of minor importance, and it is by far the most interesting portion of the subject. The scientific names need not, in all cases, be learned. They have been used because common names are so often misleading.
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