Part II

: _Principles._ 12mo of 406 pages, illustrated. Cloth, $2.00 net.

~ILLUSTRATED~

There is no other book just like this. Not only does it give the salient facts of structural zoology and the development of the various branches of animals, but also the natural history--the _life and habits_--thus showing the interrelations of structure, habit, and environment. In a word, it gives the principles of zoology and _their actual application_. The economic phase is emphasized.

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