x PREFACE TO THE FIRST EDITION 



The authors are grateful to the various publishers and to the General 

 Biological Supply Company whose loans of figures are specifically 

 acknowledged under the reproductions of the illustrations in question. 

 They are greatly indebted to Messrs. Joseph C. Moore and William 

 Brudon, students in the Department of Biology, and to Dr. Albert M. 

 Laessle, instructional staff, University of Florida, for the original draw- 

 ings and diagrams. Gratitude is expressed also to Prof. A. E. Hooton, of 

 Harvard University, who very kindly read and commented on the pre- 

 liminary draft of Chaps. XXX and XXXI; to Prof. A. F. Shull, of the 

 University of Michigan, both for reading an earlier draft of the entire 

 manuscript and for his courses and publications; to Dr. Georg Neumann, 

 of Indiana University, for assistance in preparing Chap. XXXI; and to 

 the authors' colleagues in developing and teaching Man and the Bio- 

 logical World at the University of Florida — Prof. H. B. Sherman and 

 Drs. A. F. Carr, H. H. Hobbs, and H. K. Wallace — who have provided 

 many pertinent suggestions and criticisms. Finally the authors wish to 

 acknowledge the unvarying cooperation of Dean W. W. Little, of the 

 General College of the University of Florida, and the freedom he has 

 granted and maintained for them in choosing the viewpoints and mate- 

 rials for the biological part of a "General College" curriculum. 



J. Speed Rogers 



T. H. Hubbell 



C. Francis Byers 

 Gainesville, Fla. 

 October, 1942 



