CLARK, G. 
DR. CLARK: The only thing I did was to take the cat's tempera- 
ture and put it in a box; after three hours, I would go back and pull 
the cat out and put him on my lap and take his temperature and feel 
if he was shivering, and that is not too satisfactory. 
DR. STUART: Birzis and Hemingway stimulated a locus in the 
tuberal hypothalamus to produce shivering. Didn't you say that a 
lesion that spares this region has no effect on shivering? 
DR. CLARK: No, Keller has some dogs where he has had just 
that medial part destroyed, and they regulate against cold quite well. 
It takes a tremendous lesion to get any long-term effects. 
DR. FREEMAN: There is another point about your data that has 
always interested me. This also applies to the data from Igor and 
Hanson on exposing these animals to high ambient temperatures. 
Their body temperatures will go up in their terms to 42 C and level 
off there despite continuance of the heat stress, and I notice in your 
data that almost all these animals have temperatures that range from 
41.11 C to 41.18 C, a very narrow range. 
DR. CLARK: Well, that is very simple. I did not want to hurt the 
animal. 
DR. FREEMAN: You were watching for it then? 
o 
DR. CLARK: When the temperature reached 41.11 C, I stopped 
the test; but since I only took the temperatures at intervals, in some 
cases the temperature went above that. 
DR. FREEMAN: That is humanitarian, yes, but how about the 
data of Teague and Ranson's studies, showing that with continuation 
of the heat stress there is prevention of hypothermia in all their 
animals? 
DR. CLARK: Well, I do not think that is quite the way it went 
because they also stopped their tests that way. 
DR. FREEMAN: I can recall some of the heat stress. I remem- 
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