116 A BIOMETRIC STUDY OF BASAL METABOLISM IN MAN. 



The regressions of heat per kilogram on age show that there is an 

 average yearly decrease of from 0.098 to 0.169 calorie per kilogram per 

 24 hours in heat-production in the larger series of men and from 0.046 

 to 0.124 calorie per 24 hours in the larger series of women. 



Absolute values are of course much larger in the case of body- 

 surface because the number of square meters of area is much smaller 

 than the number of kilograms of weight. The constants show an 



2495 

 2395 

 2235 

 2195 

 209S 

 I 99S 

 1895 

 1735 

 1695 

 1535 

 14-95 

 I39S 

 I29S 

 1195 

 JOSS 



15 20 2S 30 35 40 4-5 SO SS 60 65 



AGE 



DIAGRAM 19. Daily heat-production of men classified according to age. 



annual decrease of from 3.20 to 5.25 calories per square meter per 24 

 hours in the larger series of men and from 2.33 to 2.96 calories per 

 square meter per 24 hours in the larger series of women. 



In the foregoing discussion the influence of the factor of body-size 

 has been to some extent minimized by expressing the decrease in 

 heat-production in calories per kilogram of body-weight and in calories 

 per square meter of body-surface as estimated by the Du Bois height- 

 weight chart. 



It is quite possible to correct for the influence of both stature and 

 weight in a different way. We have already used the partial correla- 



