This book consists of three parts; the first is an introduction, giving a classification of the animal kingdom, with a Zootomical account of its various Sub-kingdoms and their subordinate Divisions and Classes; the second consists of descriptions of certain readily procurable specimens which illustrate in the concrete a very large number of the systematic descriptions contained in the introduction; and the third contains descriptions of figures supplementary to the descriptions of specimens, and intended to aid them in furnishing that groundwork of particular facts, without which it is impossible to obtain any real knowledge or permanent hold of general principles.