ADAPTATIONS TO TROPICS AND ALTITUDES 



MORRISON: No, these were not, in general, situations in which 

 the body temperature was falling progressively. And, in fact, in 

 many instances in comparing a 1- to a 2-hour or a 2- to a 4-hour 

 exposure, the second body temperature would be higher than the 

 first. These are essentially maintenance temperatures. 



EAGAN; Did most of your measurements consist of several 

 measurements on one animal in order to arrive at the statistics, 

 or a single measure of the single animal? 



MORRISON: Measurements of several animals; but not in all 

 cases. This is one aspect of comparative physiology in which one 

 cannot be too fancy in experimental design because the most impor- 

 tant point of departure is to catch an animal. The work on the very 

 interesting bilby represented a single individual. I do not like to 

 work on a single individual any more than the rest of you, since it 

 imposes limitations, but it is amazing what can be found out from 

 a single specimen if it is husbanded. 



EAGAN: Do you lump the data all together then, or do you aver- 

 age them for animals under the same conditions? 



MORRISON: Well, we do both essentially. Usually the data are 

 plotted with individuals identified to see whether there are different 

 patterns of response. If none is seen, the data is then grouped and 

 averaged without respect to the individual. In the "triple response" 

 of the bat Phyllostomus to cold there were some definite correla- 

 tions such that one individual always gave high values while two 

 others always gave low values. 



IRVING: Would it be anything more than a scheme for trying to 

 organize some of the information in my memory to think that their 

 very interesting elevation of the metabolic rate after its decline in 

 moderate conditions, when the animal was further cooled resembles 

 the response that one sees in bats and arctic ground squirrels? 

 Do you recall that bats and arctic ground squirrels do awaken from 

 hibernation if the body temperature is cooled below a certain level; 

 some of the hibemators will reawaken and begin to generate heat 

 actively. Do you think this phenomenon of yours is perhaps another 

 phase of the same sort of thing? 



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