180 



Metabolism of Healthy Max. 



poses of comparison, the body-weight and height are likewise given. The 

 amount of oxygen consumed per hour by man varied in these experiments from 

 17.7 grams with the subjects S. A. B. and H. L. K., to 25.9 grams with the sub- 

 ject H. A. The average of all the subjects was 21.3 grams per hour. It is to 

 be understood that these values represent the average of the period from 1 a. m. 

 to 7 a. m. Usually this period was subdivided into three 2-hour periods. 



Expressing the results according to the method which is more commonly 

 used by writers, namely, as cubic centimeters per minute, we find the lowest 

 oxygen consumption is 206 c. c. and the highest 302 c. c, the average for all the 

 subjects being 249 c. e. of oxygen per minute. 



Table 71. Oxygen consumed during sleep by different individuals (1 a. m. to 7 a. m.). 



1 In computing body-surface the formula of Meeh has been used : 12.312 Vbody-weight. 



Per kilogram of body-weight. That there may be variations in oxygen con- 

 sumption due to variations in the size of the individual is easily conceivable, 

 and it is only when the results are compared on the basis of per kilogram of 

 body-weight per hour that we have a proper classification. The results have 

 been so calculated and they are presented in table 71. It is seen that the 

 minimum absorption of oxygen per kilogram per hour was with the subject 

 W. O. A., namely, 0.251 gram. The largest amount was with the subject, 

 H. A., 0.403 gram. The average for all subjects showed an oxygen absorption 

 per kilogram per hour of 0.322 gram, somewhat less than the carbon-dioxide 

 production, 0.354 gram, under similar conditions. In converting these results 

 to cubic centimeters per kilogram of body-weight per minute, the lowest is 

 2.92 c. c. and the highest 4.70 c. c. The average for all the subjects is 3.75 c. c, 

 as against 3.01 c. c. of carbon dioxide under the same conditions. 



Per square meter of body-surface. Making due allowance for the fact that 

 body-surface does not vary directly with the body-weight, the results per square 

 meter of body-surface per hour have been computed for these subjects. The 



