CHANGES IN METABOLISM WITH AGE. 



115 



Men, original and first supplementary series, N = 117 



h = 1848.47 -8.38 a ^.=29.366 0.139 a 



Men, second supplementary series, N = 19 



h = 1845.34 -6.40 a ^=27.588 -0.070 a 



Men, other than Gephart and Du Bois selection, jV = 64 



h = 1815.48 -6.20 a h k =28.862 -0.116 a 



Men, of three series, ^ = 136 



h = 1823.80 -7.15 a A* =28.703 -0.112 a 



Women, original series, N = 68 



h = 1448.54: -3.52 a f> k =26.580 -0.046 a 



Women, supplementary series, N = 35 



h = 1412.33 -1.85 a A fc =28.590 -0.147 a 



Women, both series, N = 103 



h = 1420.47 -2.29 a A t =28.308 -0.124 a 



h D = 1037.51 -4. 29 a 

 h D = 1016.38 -2.89 a 

 AC = 1014.29 -3.20 a 

 h D = 1022.17 -3.60 a 

 h D = 927.58 -2.33 a 

 h D = 948.70 -3.22 a 

 h D = 942.25 -2.96 a 



These equations fail to give the comparative view of the relationship 

 between age and total heat and age and heat per unit of body-size that 

 is afforded by the correlation coefficients. They give information of a 

 very different and very essential sort concerning the relationship 

 between age and heat-production. 



nes 

 i ess 



< 



-IS 65 



'OSS 



3SS 



IS 20 25 30 35 4-3 45 SO 



60 6S 70 75 



AGE 



DIAGRAM 18. Daily heat-production of women classified according to age. 



The variable term of the equations for the regression of total heat 

 on age shows that in the larger series of men the daily heat-production 

 of an individual decreases by an average amount of 2.45 to 11. 85 calories 

 per 24 hours for each year of life. Naturally 7.15 calories, based on 

 the whole series, must be taken as the most probable value. With the 

 women the decrease in heat-production per 24 hours is 1.85 calories 

 in the 35 supplementary women, 3.52 calories in the 68 women in the 

 original series, and 2.29 calories in the whole (103) series. Naturally 

 the latter value must be taken as the standard until further data are 

 available. 



Diagrams 18 and 19 show the distribution of the individual meas- 

 urements with reference to the straight-line equations. 



