Yoakum, Behavior of Squirrels. 



S^Z 



TABLE V. 



Tests on Temperature Discrimination of Squirrels. 



1 At this point a change in conditions was made, see p. 567. 

 ^ Exckisive of series 15, 16, 17 and 18. 



did not come in contact with the side of the box. It was determined 

 by a series of trials that when the temperature thus obtained was 40° 

 Centigrade, the air in the center of the opening the same distance 

 from the entrance was from 1.5° to 1,25° lower. These conditions 

 were kept constant and tested before and during each daily series of 

 experiments. 



Flexible rubber tubing was used for making the water connec- 

 tions from the overhead piping. This tubing permitted the raising 

 of one box over the other, which was necessary in order to rule out 

 the position factor. Shifting the large heavy boxes was done by 

 means of a rope and pully (P). The temperature boxes them- 

 selves, the space in front of them, the passageway between them. 



