GASEOUS METABOLISM DURING REST. 



517 



The normal heat production, which was found on September 29-30 

 and has previously been recorded in table 114, is 1.10 calories per kilo- 

 gram per hour and 40.8 calories per square meter per hour. The 

 restricted diet began with breakfast on the morning of October 4. 

 Approximately 10 days later (October 13-14), a second metabolism 

 experiment showed a profound fall in the heat production to 1.02 cal- 

 ories per kilogram per hour and 37.6 calories per square meter per hour, 

 a decrease of 7.3 per cent and 7.8 per cent, respectively. It so happens 

 that these first two experiments represented values obtained with 

 exactly the same personnel. 



Table 131. — Minimum metabolism during sleep as measured in group respiration 



chamber — Squad A. 



1 Values represent 1 1 men only. 



In the experiment on the night of October 27-28 but 11 men were in 

 the squad. Hence there was a change in the total body-weight and 

 body-surface and in the carbon-dioxide production. The heat pro- 

 duction per kilogram of body-weight, however, is nearly identical with 

 that obtained two weeks before, namely, 1.01 calories, but there was a 

 decrease in the heat per square meter from 37.6 to 36.4 calories. 



On November 10-11 the squad again consisted of 12 men and the 

 heat production changed to 0.97 calorie per kilogram and 34.4 calories 

 per square meter. These values remained essentially constant for 

 the next four experiments, these being made on the nights of November 

 24-25, December 8-9, December 19-20, and January 12-13. It should 

 be noted that beginning with December 19-20, the values are again for 

 11 men. On the night of January 26-27 another decided alteration 

 was found in the heat production per kilogram of body-weight, which 

 fell to 0.90 calorie, and in the heat production per square meter of body- 

 surface, which fell to 31.8 calories. One week later, February 2-3, the 



