PHYSICAL AND PHYSIOLOGICAL MEASUREMENTS. 



89 



The second point of interest pertains to the problem of the relative 

 magnitude of the correlations for weight and gaseous exchange and 

 stature and gaseous exchange. 



The differences between the correlations for stature and oxygen 

 consumption and carbon-dioxide excretion, and body-weight and oxy- 

 gen consumption and carbon-dioxide excretion are shown in table 28. 

 With one single and numerically insignificant exception in the case of 

 oxygen, the correlation between weight and gaseous exchange is higher 

 than that between stature and gaseous exchange. A number of the 

 differences are large enough in comparison with their probable errors 

 to be looked upon as statistically significant. 



TABLE 28. Comparison of correlations between weight and gaseous exchange and stature and 



gaseous exchange. 



Body-mass is, therefore, a more important factor in determining 

 (in the statistical but not necessarily in the causal sense) gaseous 

 exchange than is stature. 



7. WEIGHT AND TOTAL HEAT-PRODUCTION. 



That large individuals should produce absolutely more calories 

 than small ones would seem a natural a priori assumption. Our prob- 

 lem at this moment is to determine how intimate is the relationship 

 between body-mass and heat-production. Examining, first of all, the 

 results for the series of infants we find: 



For males JV = 51 



For females . . . N = 43 



r^A= 0.7520 0.0411 

 r w * = 0.8081 0.0357 



r/E r = 18.30 

 r/E r = 22.64 



Difference 0.0561 0.0544 



Disregarding sex and treating boy and girl babies together, we have 

 r vh =0.7833 0.0269 r/E r =29.12 



