. Carnegie Institution of Washington publication. CHANGES IN METABOLISM WITH AGE. 115 Men, original and first supplementary series, N = 117 h = a ^.=— a Men, second supplementary series, N = 19 h = a ^= a Men, other than Gephart and Du Bois selection, jV = 64 h = a hk = a Men, of three series, ^ = 136 h = a A* = a Women, original series, N = 68 h = : a f>k = a Women, supplementary series, N = 35 h = a Afc = a Women, both series, N = 103
. Carnegie Institution of Washington publication. CHANGES IN METABOLISM WITH AGE. 115 Men, original and first supplementary series, N = 117 h = a ^.=— a Men, second supplementary series, N = 19 h = a ^= a Men, other than Gephart and Du Bois selection, jV = 64 h = a hk = a Men, of three series, ^ = 136 h = a A* = a Women, original series, N = 68 h = : a f>k = a Women, supplementary series, N = 35 h = a Afc = a Women, both series, N = 103 h = a At = a hD = a hD = a AC = a hD = a hD = a hD = a hD = 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 < -IS65. '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 to calories per 24 hours for each year of life. Naturally 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 calories in the 35 supplementary women, calories in the 68 women in the original series, and 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
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