ANTERIOR HYPOTHALAMIC LESIONS 
liLj HOURS 
ILY I 2 3 5 6 
NOTE DASHED LINE 
INDICATES 
SHIVERING 
-DOG 28 
5 MONTHS 
AFTER 
OPERATION 
,^nM;1\^xx..^sx.x.^ 
^5 ENVIRONMENTAL TEMPERATURE "C .x, 
^^^^\\\\\W DOGS 28 a 35s\\\\\\\\\\sS> 
39j_, 
38^ 
3eS 
35_i 
32^ 
30 
29 
2-8 
27 
26 
25 
Figure 14. Rectal temperature curves of dogs (28 and 35) in 
which all central regulation against a cool environment was elim- 
inated by a large lesion placed in the posterior hypothalamus. 
These dogs' temperature curves are contrasted with an unoperated 
dog's (46) temperature curve, when stimulated by the same cooling 
load. Stippling in the curve indicates the presence of shivering. 
167 
