vin PREFACE TO THE FIRST EDITION 



" Mammals Living and Extinct," Flower and Leydekker; 

 " Primary Factors of Organic Evolution," E. D. Cope; 

 " Vertebrate Zoology," J. S. Kingsley; " Anatomic des 

 Hundes," Ellenberger and Baum; "Human Physiology," 

 Schenck and Giirber; " Osteology of the Mammalia," 

 Flower ; " Human Histology," Piersol. 



In the preparation of this book I have consulted a large 

 number of works on human and comparative anatomy and 

 physiology. Those giving most assistance are the works 

 mentioned above, in addition to " Mammalian Anatomy " 

 by Jayne, " Anatomic Descriptive et Comparative " by 

 Strauss-Durckheim, " Nervose Centralorgane " by Edinger, 

 and "Vertebrate Palaeontology" by Woodward. I am 

 especially indebted to my artist, Mr. W. H. Reese, of the 

 Phillipsburg High School, for the care and patience exer- 

 cised in making the drawings from my own dissections. 

 Mr. D. S. Hartline, of the Bloomsburgh State Normal 

 School, has read the entire manuscript and made valuable 

 criticisms. Above all, I have to thank Prof. J. S. Kingsley 

 for numerous valuable suggestions and important cor- 

 rections in the manuscript. 



ALVIN DAVISON. 



