220 A BIOMETRIC STUDY OF BASAL METABOLISM IN MAN. 



groups the average heat-productions predicted on the assumption that 

 the subjects were boys of like body-length are higher and in three 

 groups they are lower than the actual mean values. Thus, as far as 

 this test goes, it furnishes no evidence of a sexual differentiation in 

 metabolism in new-born infants. 



TABLE 85. Tests for differences in metabolism of male and female infants. 



The differences between the actual heat-production and the theo- 

 retical heat-production as calculated from the regression of total heat 

 on body-surface in the boys are shown for groups of girl infants classi- 

 fied according to body-surface by the Lissauer formula in the first 

 section of table 86. Those calculated from the equation for the rela- 

 tionship between total heat-production and body-weight in the boys 

 appear in groups of various body-weights in the first part of table 87. 



TABLE 86. Tests for differences in metabolism of male and female infants. 



By both of these methods of computation and analysis, the results 

 are very similar to those found in the grouping by stature above. 

 Some of the groups show a lower, others a higher, metabolism than 

 the computed value. Taking these data as a whole they afford no 

 evidence that the sexual differentiation in metabolic activity demon- 

 strated for the adults obtains in new-born infants. 



Using the multiple-regression equation, 



/i=22.104+31.049M>+1.162s, 



for the boy babies, to predict the heat-productions of the girl babies 



