ANTERIOR HYPOTHALAMIC LESIONS 
A/ct^^A -A A A 
^^o 
NOTE DOTTED LINE 
INDICATES 
BURSTS OF 
PANTINC 
45 
44 
43 
42 
4 I 
40 
39^ 
3 8i 
3 7? 
36i 
35a 
33'- 
32< 
31^ 
30°^ 
29 
28 
Figure 15. Rectal temperature curves, of the same operated 
dogs shown in "a", duringthe six-hour exposure to an environmental 
temperature of 37° C to 38° C. These dogs' entirely normal regu- 
lation against a heavy heat-load is contrasted with the rectal 
temperature response of another dog (72-D) in which all heat 
dissipating abilities were absent. Stippling indicates the presence 
of panting. 
