120 A BIOMETRIC STUDY OF BASAL METABOLISM IN MAN. 



(4) Considering both sexes and the three lines for each, it is im- 

 possible to assert, on the grounds of inspection merely, that a curve of 

 a higher order would be more suitable than a straight line for smoothing 

 the means. 



'IS 



S7 



62 



67 



AGE 



DIAGRAM 21. Mean daily heat-production per kilogram of body-weight 

 of men and women classified according to age. 



(5) In all three relationships the line graduating the means for the 

 men lies above that for the women. In general this is also true of [the 

 empirical means. 



We note that (1) is merely another expression for results already 

 demonstrated by the correlation coefficients, namely that the relation- 



8SO 



SOO 



7SO 



It 22 27 32 37 4-Z 47 SZ S7 F2 



AGE 



DIAGRAM 22. Mean daily heat-production per square meter of 

 body-surface of men and women classified according to age. 



ship between age and heat-production is more intimate if correction be 

 made for the irregularities of body-size. 



Result (2) will be tested by statistical methods below. Results 

 (3) and (5) are expressions of the sexual differentiation in adults which 

 will be reserved for treatment in detail in Chapter VII. 



