BASAL METABOLISM OF NORMAL MEN AND WOMEN. 215 



These results are expressed graphically in the second figure, B, of 

 diagrams 27 to 30. These figures differ from those representing pre- 

 diction from linear equations (A) in that the mean theoretical heat- 

 productions do not lie in sensibly a straight line. The discrepancy is 

 especially great in the classification by stature, where the disturbing 

 influence of weight is very obvious. 



The difference between the graphs for body-weight and body-sur- 

 face area is not quite so clearly marked as in the case of the linear 

 equations, but the more conspicuous deficiency in the metabolism of 

 the heavier women is manifest. 



The results fully confirm the analysis on the basis of the linear 

 equations. 



We now turn to the results secured when age as well as body-weight 

 and stature is taken into account in determining the theoretical heat- 

 productions of the women. The equation, based on the 136 men, is 



h =66.4730+13.7516 w +5.0033 s- 6.7550 a 



By the evaluation of this equation for each woman by inserting her 

 weight w, stature s, and age a, we obtain her probable heat-production 

 on the assumption that she is a man of like weight, stature, and age. 



A comparison of the calculated average heat-productions of women 

 grouped by age, weight, body-surface, and by stature is made in the 

 final sections of tables 77, 79, 80, and 81. 



With one exception that of the lowest-weight group containing 

 only 2 women which is numerically insignificant, the 39 comparisons 

 indicate that the actual heat-production is lower than it would be if 

 these individuals were men of the same age, stature, and body- weight. 

 The amount by which the women fall short of their computed metab- 

 olism is measured by differences ranging from 4.9 to 7.8 when the classi- 

 fication is on an age basis, from 2.7 to 22.6 when grouping is made by 

 stature, from 1.4 to 17.7 when body-surface serves as a basis of classi- 

 fication, and (disregarding the one exceptional case) from 3.9 to 18.2 

 per cent when the women are thrown into groups of like body-weight. 



The results are represented graphically in the third figure, C, of 

 diagrams 27 to 30. Correction for age has perhaps tended to reduce 

 slightly the differences between the observed and predicted-heat 

 productions, but (with the one slight exception already noted) they are 

 nevertheless conspicuous and persistent throughout the whole range 

 of whatever scale of classification is employed. 



The reader will note that when the correction for age, stature, and 

 weight is made and the individuals are classified by age, the theoretical 

 and the empirical heat-productions are separated by roughly the same 

 distance throughout the whole age range. 



As far as this method of analysis is concerned, more conclusive 

 proof of the existence of a sexual difference in the metabolism of male 



