This compendium is designed for use in grammar and high schools. It is introductory to the author's larger zoology text. Though partly rewritten, and with additions regarding the habits of birds and mammals, portions of the larger book have been retained, the more difficult parts being omitted so as to adapt it for younger pupils, or those whose time is limited. No class in the study of Zoology should depend on a book alone, but specimens should be in constant use--the text-book being rather for reference--as all school work in Zoology should be object-teaching.