viii ACKNOWLEDGMENTS 



Journal of Preventative Medicine, John McCormick Institute for In- 

 fectious Diseases 

 Figure 193 



Light and Behavior of Organisms by S. O. Mast, 1911. John Wiley 

 and Sons, Inc. 

 Figures 99, 107 



Physiological Zoology, University of Chicago Press 

 Figures 95, 113, 126, 180 



Publications of the Carnegie Institute of Washington 

 Figure 214 



Science 



Figure 123 



Transactions of the American Microscopical Society 

 Figures 36, 37 



University of California Publications in Zoology, University of Cali- 

 fornia Press 



Figures 15, 16, 39, 49, 50, 53, 54, 55, 70, 85, 86, 87, 88, 89, 

 146, 148, 150, 151, 196, 219, 225 



United States Geological Survey of the Territories 

 Figure 221 



Finally, it is a pleasure to recognize the care and patience on the part 

 of the staff of the Columbia University Press in the preparation and 

 distribution of this v^ork. While all members have worked diligently 

 and harmoniously with us, we are particularly indebted to^ Miss Georgia 

 W. Read, Miss Ida M. Lynn, and Miss Eugenia Porter for the meticu- 

 lous care with which they have sought to unify and, in some cases, to 

 clarify the manuscripts on subjects unfamiliar to them. 



The Editors 

 New York City 

 January 2, 1941 



