VI PREFACE 



teacher's actual procedure. The numbered parts of the book 

 indicate the classification of the study of animals into particular 

 phases or kinds of study rather than a definite linear arrange- 

 ment or sequence of this study. The lessons or subjects of 

 Part IV, for example, should be interpolated wherever the 

 teacher finds fittest opportunity in connection with the study of 

 special animals or groups of animals. Chapters A^I, VII, and 

 VIII of Part II have to do with that part of the study of animals 

 which, as usually treated, demands the facilities of equipped 

 laboratories. As here treated no laboratory work is required, 

 but these chapters have been arranged to call for the continuous 

 and thoughtful "seeing why" of facts mostly already familiar 

 to the pupil. In this way the author believes that what little 

 knowledge of the internal anatomy of animals young people can 

 get will have a maximum of worth. 



The author wishes to express his special obligations to Dr. 

 O. P. Jenkins, professor of physiology in Stanford University, 

 for the first draft of Chapters VI, VII, and VIII of Part II, and 

 to thank Mrs. D. S. Jordan and Miss Isabel McCracken for their 

 critical reading of the MS. and proof-sheets, respectively, of the 

 book. For aid and courtesy in the matter of illustrations the 

 author's thanks are due Miss Mary Wellman, who made all the 

 drawings for figures whose origin is not elsewhere specifically 

 indicated, and to Professors M. V. Slingerland of Cornell Uni- 

 versity and L. L. Dyche of Kansas State University, Dr. L. O. 

 Howard, U. S. Entomologist, Mr. Geo. O. Mitchell of San 

 Francisco, Mrs. Elizabeth Grinnell of Pasadena, California, Mr. 

 J. O. Snyder, Stanford University, Mr. Frank Chapman, editor 

 of "Bird-Lore," Mr. G. O. Shields, editor of "Recreation," 

 Mr. C;eo. A. Clark, secretary U. S. Fur Seal Commission, the 

 American Society of Civil Engineers, Cassell & Co., the Out 

 West Publishing Co., Camera Craft, "The Condor," and the 

 Whitaker and Ray Co. of San Francisco. The illustrations 

 got from these various sources are all specifically indicated in 

 connection with their special use. 



Vernon Lyman Kei.i.occ;, 



Stanford University, May, 1903. 



