PREFACE ix 



neglect that it has received at the hands of research investigators. 

 There is considerable Hterature on the behavioural aspects of tem- 

 perature sensitivity, little of value on the physiological aspects. 



The co-operation and courtesy of a number of persons and organi- 

 zations has been invaluable in the preparation of this book. Paul B. 

 Hoeber, Inc. has granted permission to reprint sections of Chapter 

 II which formerly appeared in Roots of Behavior, edited by E. L. 

 Bliss. Similarly, the Society for Experimental Biology has granted 

 permission to reprint sections of Chapter V which appeared in 

 Symposium No. 16of the Society for Experimental Biology. Figs. 17, 

 18, 21, and 25 were supplied through the courtesy of M. L. Wolbarsht ; 

 Figs. 40 and 41, through the courtesy of O. Lowenstein and L. H. 

 Finlayson; Figs. 56, 65, 66, and PI. I, through the courtesy of K. D. 

 Roeder and A. E. Treat; PI. Ill, through the courtesy of J. R. Adams. 

 Peter G. Walsh has assisted in the preparation of illustrations. To 

 all of these I express my sincere gratitude. 



V. G. Dethier 



E. Blue Hill, Maine 

 June 1962 



