Preface vi 



papers. A few examples of important synonymous genera are given with the 

 older name in parentheses: Amoeba mira (Flabellula mira), Aurellia 

 (Aurelia), Neanthes virens (Nereis virens), Xiphosura (Limulus), Crago 

 (Crangon), Crangon (Alphaeus), Uca (Gelasimus), Ambystoma (Ambly- 

 stoma). 



This book was written to satisfy the need for a systematic organization of 

 the diverse facts in the literature of comparative physiology and to emphasize 

 and extend the comparative viewpoint in physiology as a^whole. Generahza- 

 tions are drawn only when the existing data seem to warrant, but new gen- 

 eralizations have emerged from the organized facts. Every chapter includes 

 numerous suggestions of unknowns, problems which need to be solved in the 

 near future. 



The authors are grateful to their many colleagues who have contributed 

 in discussions of the various topics. In particular they express their gratitude 

 to the following, each of whom has critically read one or more chapters: 

 E. J. Boell, J. B. Buck, T. H. Bullock, H. E. Carter, Peter Du Bruyn, Gottfried 

 Fraenkel, E. N. Harvey, S. C. Kendeigh, Rudolph Kempton, George Kidder, 

 Lewis Kleinholz, Peter Morrison, O. P. Pearson, Robert Ramsey, A. C. Red- 

 field, H. B. Steinbach, C. D. Turner, and Albert Tyler. 



Undoubtedly many errors of fact and interpretation still remain, and the 

 authors hope that attention may be called to these by teachers, students and 

 in\'esti2ators who use this book. 



The Authors 



September, 1950 



