604 



JOHN K. 



TABLE 17 

 COOLING POWEB OF AIB CURRENTS AT DIFFERENT VELOCITIES (Hill) 



Flack and Hill made observations on the respiratory metabolism of several 

 students by the Doublas-bag method (p. 537) and found that the heat pro- 

 duction as calculated by the Zuntz-Schumberg method (p. 565) increased 

 in different subjects from 27 to 82 per cent when they were sitting quietly 

 on the roof of the laboratory, over tho metabolism shown in the laboratory - 

 in the same clothing. For example, in one instance the heat production 

 was 1.57 calories per minute in the laboratory and 3.12 Cal. in a strong 

 cold wind on a snowy day. In another instance exposure to the inclement 

 cold winds of an April (1918) day increased the resting metabolism of a 

 young woman from 37 to 65 calories per sq. M. of body surface per 

 hour. 



Lefevre had a subject who while lying on a bed naked, in an air cur- 

 rent at 5 C. and of 1-2 meter per second velocity, for 3% hours, exhibited 

 a heat loss of 3 Cal. per minute as contrasted with 1.55 calories at 20 C. 

 Sitting quietly in ordinary light clothes a man gave the following records 

 of heat loss in air currents of 3.5 and 1 M. per second. 



TABLE 18 



IV. The Ingestion of Food Increases the Metabolism 



The observation of Lavoisier that the heat production was increased 

 by taking food was confirmed by Pettenkofer and Voit(fr), who found that 

 the total metabolism of a dog was increased from 34.9 to 65 calories 

 per kilogram as the result of eating about two and one-half pounds of 



