NERVOUS PATHWAYS 
DR. FREEMAN: As Bonvallet pointed out, this tendency was 
predominant in small animals; the smaller the animal, the greater 
his range of variance. I think he quoted figures indicating that a rat 
can vary it over a range of forty times, whereas, in man, it is 
greatest at about one or two times. That is a large mammal. This 
form of regulation is important in the smallest one with a high ratio 
of surface area to body weight. 
DR. HANNON: Yes, this is true. 
DR. FREEMAN: So that you would not expect it to be as pre- 
dominant in dogs, but nevertheless, he thought there existed a 
mechanism in dogs which was the same as that in other animals, 
but not as effective. 
DR. CLARK: You can demonstrate that in spinal cats. 
DR. FREEMAN: How? 
DR. CLARK: If you take a cat that has had the cord severed at, 
say, C6, C7, and you had him alive for months, if you put him in a 
temperature of 18 C, his temperature will drop way down and then 
over a course of a few days, it will come up to almost what it was 
before. You take him then and put him in 29 C, and his temperature 
goes up to 39 C or 40 C, and it takes about 3 to 5 days for his 
temperature to come back to normal level. 
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