io6 



A. O. WEESE. 



EXPERIMENT 34. 



TABLE II. 



SHOWING THE REACTIONS OF Phrynosoma IN AN AIR TEMPER- 

 ATURE GRADIENT. 



The temperatures of the thirds of the cage are in each case indicated at the top 

 of the column. Readings were taken at one-minute intervals. For discussion see 

 page 105. 



1 Substratum cooled to 20. 



