ACKNOWLEDGMENTS 



The authors wish to make grateful acknowledgment to all who 

 have aided them in the preparation of a college textbook in biology. 



In particular, mention should be made of the members of the Biology 

 Department of Wesleyan University who so willingly collaborated in 

 trying out the ecological approach to a study of general biology for 

 several years prior to publication of this book. Grateful acknowledg- 

 ment is also made to them for innumerable suggestions as well as for 

 their willingness to include certain successful features of the course in 

 the text. Their help and advice has frequently been sought and 

 willingly given. 



Special mention should also be made of the tireless effort and 

 willing help of Wanda S. Hunter and Alice Hall Walter, both of whom 

 read the manuscript and proof and contributed much to whatever 

 success this book may attain. 



It is impossible here to enumerate all who have aided in the 

 production of this book, but the following names must be men- 

 tioned : Dr. E. C. Schneider, Shanklin Biological Laboratory, 

 Wesleyan University, for reading the entire manuscript ; Dr. Francis 

 R. Hunter, Rhode Island State College, for reading the entire proof ; 

 Dr. Aurel O. Foster, Gorgas Memorial Laboratory, Panama, for 

 reading section XII ; Dr. Hurbert B. Goodrich, Shanklin Biological 

 Laboratory, Wesleyan University, for reading sections XIX-XXIII ; 

 Dr. Frederick L. Hisaw, Biological Laboratories, Harvard University, 

 for reading section XVIII ; Dr. John A. AIcGeoch, Psychological 

 Laboratory, Wesleyan University, and Dr. Bernard C. Ewer, Depart- 

 ment of Psychology, Pomona College, for reading section XVH ; 

 Dr. Philip A. Munz, Department of Biology, Pomona College, for 

 reading the botanical portions of the book ; Messrs. Emil Kotcher 

 and Wilson C. Grant for aid in preparing the index. 



Acknowledgment is also made to organizations and individuals 

 without whose co-operation it would have been impossible to secure 

 many of the instructive and attractive illustrations. 



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