FROM PREFACE TO FIRST EDITION vii 



Guthrie's General Zoology (John Wiley & Sons) ; Wilson's Physical 

 Basis of Life (Yale University Press); and Hegner's College Zo- 

 ology, Lindsey's Evolution and Genetics, Lull's Organic Evolu- 

 tion, Metcalf's Organic Evolution, Newman's Vertebrate Zoology, 

 Parker and Haswell's Textbook of Zoology, Peabody and Hunt's 

 Biology and Human Welfare, Scott's The Theory of Evolution, 

 Shipley and McBride's Zoology, Walter's Genetics (The Macmillan 



Co.). 



Furthermore, the author is indebted, of course, to innumerable 

 sources for the facts and principles outlined and for suggestions 

 for figures adaptable to present needs. Many of these references 

 are specifically mentioned in the preface to the Foundations of 

 Biology and are listed in the bibliography of the present volume. 

 Finally, to The Macmillan Company the author is grateful for its 

 hearty and generous cooperation in all the arrangements incident 

 to publication. 



L. L. Woodruff 



Yale University, 

 February, 1932. 



