HART 



PROSSER; Yes. Is it possible that there might be differences 

 in the endocrine response mechanism? 



HART: You might have the same input and a different res- 

 ponse to the input. 



PROSSER: Have you any evidence about the response of 

 either the thyroid or adrenal in these different series? 



HART: Absolutely none. 



PROSSER: It seems to me that endocrine response would be 

 an alternate explanation. Of course this could be explored. 



EAGAN: However, this endocrine response could be mediated 

 only through the nervous system. 



PROSSER: Yes, but the sensory input might be the same. 



HART: Is there any way of assessing sensory input in animals? 

 I do not know of any. 



PROSSER: It certainly would be worthwhile to try to record 

 the nerve impulses in response to a given cold stimulus. 



KLEIBER: I do not think I would be accused of particularly 

 being in love with body surface or against the three- fourths power 

 of body weight. But when you express the specific insulation, I 

 wonder if it would not be wise, for internal consistency, to express 

 the metabolic rate per unit surface, whatever it might be. I mean 

 that you should use weight to the two- thirds power instead of the 

 three- fourths, because otherwise you might introduce a side effect 

 in this insulation which is actually not present. 



HART: This is really a measure of metabolism, though. 



KLEIBER: Yes, but the metabolism in this case is related to 

 heat exchange and the metabolism related to heat exchange is a 



240 



