90 A BIOMETRIC STUDY OF BASAL METABOLISM IN MAN. 



These results are larger than those for stature (length) and total 

 heat, which are 0.1329^0.0712 smaller for males, 0.0655 0.0583 

 smaller for females, and 0.0985^0.0457 smaller for male and female 

 babies considered together. 



The change in actual heat-production in calories per 24 hours for a 

 variation of a kilogram in body-weight is shown by the regression 

 equations, which are: 



For males h = 25.16 +34.52 w 



For females h =26. 18 +34.23 w 



The results are in remarkably close agreement. In both male and 

 female babies a difference of 100 grams in weight between two subjects 

 would mean a probable difference of 3.4 calories in their daily 

 heat-production. The results are represented graphically in diagram 



-- MALE INFANTS 

 --.- FEMALE INFANTS 



369 



4.M 



433 



474 



BODY WEIGHT 



DIAGBAM 12. Mean total daily heat-production by male and female infants of 



various body-weights. 



12. The lines for the boy and girl babies lie very close together indeed. 

 While the observed means show considerable irregularity, this is appar- 

 ently attributable to the (statistically) small number of observations 

 available, and a straight line seems to serve quite as well as a curve 

 of a higher order to smooth the results. 



Turn now to the available data for the adults. The correlations 

 between body-weight and heat and the partial correlations between 

 body-weight and heat-production for constant stature are set forth in 

 table 29. 



Considering first the actual correlations between body-weight and 

 total heat-production, it is clear that the relationships are very high. 

 For men they are of the order r =0.80 in the larger series, although the 



