MILAN 



previous 125 days. The averaged responses of the control fingers 

 of this group were compared with the averages for the right middle 

 fingers of each of the other groups. The average age for the habi- 

 tuated group was 27 years. 



The Indian group consisted of six Alaskan natives from the 

 Tetlin Reservation. They normally spent the greater part of the 

 daylight hours out-of-doors, attending trap lines, etc. These sub- 

 jects were tested during the latter part of December, when it would 

 be expected that they would have endured considerable recent cold 

 exposure. At the time of this test, they had lived at the laboratory 

 for one week under a regimen of restricted indoor activities. Their 

 meals were taken entirely at the USAF Hospital cafeteria. During 

 the week, they had been subjected to several oxygen consumption 

 measurements and finger immersions in ice water, in connection 

 with another study. Hence, they were accustomed both to the test 

 and to the experimenter. Their average age was 23 years. 



The control group consisted of six subjects who were engaged 

 in indoor occupations andfiveof whom were employed at the labora- 

 tory. They were at ease with the experimenter but were not accus- 

 tomed to the test. It was considered that they were comparable with 

 the habituated group except for their unfamiliarity with the test. 

 Their average age was 30 years. 



The starvation group consisted of six subjects who were tested 

 1 or 2 days after returning from a regimen of starvation in the cold. 

 They had lived for 5 days camped at individual sites on river ice, 

 without food or sufficient thermal protection, in interior Alaska dur- 

 ing the month of February. They we re all accustomed to recent cold 

 exposure and to the experimenter, and four of the six were accus- 

 tomed to the test. Their average age was 27 years. 



Every effort was made to have test conditions the same for 

 the four groups. In all tests the compared fingers were immersed 

 equal depths (2.8 ± 0.1 cm ) in 0.0 C water for 10 minutes. The 

 water bath was stirred equivalently in all tests. Temperature of 



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