182 METABOLISM AND GROWTH FROM BIRTH TO PUBERTY. 



fitted the general trend, but here again, owing to the wide scatter of 

 the points, there is no evidence of regularity in the relationship between 

 heat production and surface area. With youth, even with the wide 

 scatter of the individual points in figures 42 and 43, the lines denoting 

 the general trend show pronounced deviation from a uniformly hori- 

 zontal level. 



Cals. 

 36 



CALORIES PER KILO. REFERRED TO WEIGHT. MEN. 



18 



46kgs.50 54 58 62 66 70 74 78 82 86 90 94 



FIG. 52. Basal heat production of men per kilogram of body-weight 

 per 24 hours referred to weight. 



Several important points should be emphasized in connection with 

 the comparisons of the metabolism of youths and adults on all bases 

 of comparison as indicated in figures 48, 50, and 51. One is the 

 quite remarkable coincidence of the extension of the line for boys with 

 that laid down for men, an agreement that is somewhat less striking 

 in the case of the girls and women. The data for the higher- weight 

 boys and lower-weight men, and particularly the higher-weight girls 

 and lower-weight women, are still altogether too few to consider this 

 part of the curves as clearly established. At the moment of writing, 



Cals. 

 36 



CALORIES PER KILO. REFERRED TO WEIGHT. 



WOMEN. 



12 



34kgs.38 42 46 50 54 58 62 66 70 74 78 ^32 86 90^ 94 



FIG. 53. Basal heat production of women per kilogram of body-weight 

 per 24 hours referred to weight. 



further experimental data are being obtained at the Nutrition Labor- 

 atory for ages between 12 and 20 years for both sexes. Finally, empha- 

 sis must again be laid upon the fact that all of these lines represent 

 at best only general trends, particularly with adults. 1 



From a consideration of all of the charts in which the metabolism 

 curves for boys and men on the one hand and girls and women on the 

 other are compared, it is evident that the metabolism of boys and 

 men is for practically the entire period of life perceptibly and con- 



1 See page 132 for description of method of sketching curves. 



