

PREFACE 



The introduction to this book contains all the information on its scope 

 and intentions, remarks which might have been used in a preface. Thus 

 only the statement is added here that I have tried to the best of my 

 ability to keep the facts up to date to the very moment of going into 

 print. 



I should not have been able to finish the manuscript during a time 

 of severe personal handicaps but for the devoted and unselfish help 

 given me by Dr. Leonie Kellen Piternick. I have no words to express 

 my feehngs of gratitude for everything she did, voluntarily, efficiently, 

 and graciously. Thanks are due to Dr. Sarah Bedichek Pipkin for her 

 help with the editing of the manuscript. 



This book was written while I had the privilege of a Guggenheim 

 fellowship, graciously oflFered by Dr. Henry Allan Moe. I do not need 

 to emphasize gratefully how much this meant to me. 



My thanks are offered finally to the University of California Press 

 for the traditionally fine publishing job. 



Richard B. GoLDSCHMmx 

 Professor of Zoology Emeritus 

 Berkeley, California, 1955 



