Excerpt from Comparative Zoology: Structural and Systematic, for Use in Schools and Colleges
The distinctive character of this work consists in the treatment of the whole Animal Kingdom as a unit; in the comparative study of the development and variations of organs and their functions, from the simplest to the most complex state; in withholding Systematic Zoology until the student has mastered those structural affinities upon which true classification is founded; and in being fitted for High Schools and Mixed Schools by its language and illustrations, yet going far enough to constitute a complete grammar of the science for the under-graduate course of any College.
It is designed solely as a manual for instruction. It is not a work of reference, nor a treatise. So far as a book is encyclopediac, it is unfit for a text-book. This is prepared on the principle of "just enough, and no more." It aims to present clearly, and in a somewhat new form, the established facts and principles of Zoology. All theoretical and debatable points, and every fact or statement, however valuable, which is not absolutely necessary to a clear and adequate conception of the leading principles, are omitted. It is written in the light of the most recent phase of the science, but not in the interest of any particular theory. To have given an exhaustive survey of animal life would not only have been undesirable, but impossible.
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