HAET 

 VIERECK: Do you look for a place where the fur is thickest? 



HART : Not necessarily. 



FOLK: Possibly some experiments will be able to provide the 

 activity of the animal during oxygen consumption. Benedict has 

 stressed this so much. You find two groups of animals in your 

 series, at very cold temperatures where the metabolism is up high. 

 Some of the animals are quite restless and move around, while 

 others curl up and are quiet with high metabolic rates at these cold 

 temperatures. 



HART; In those which I have observed, I find almost invariably 

 that they are huddled up and not moving at all. When the cold is such 

 that the metabolic rate is increased close to its maximum, then 

 these animals are seldom if ever moving in my experiments. 



FOLK: Can you give examples of animals that were moving 

 under these circumstances? I think of the tropical raccoon. They 

 might be restless, which would account for part of the high 

 metabolism. 



HART: Were there not some measurements by Erikson* on 

 ground squirrels which showed a definite correlation of meta- 

 bolic rate with activity in the cold? In these animals the activity 

 was greatest at the lowest temperatures which increased the oxygen 

 consumption further. 



♦Erikson. H. 1956. Observations on the metabolism of arctic ground squirrels 

 (Citellus parryi) at different environmental temperatures. Acta. Physio l.Scandinav. 

 36:66-74. 



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