112 A BIOMETRIC STUDY OF BASAL METABOLISM IN MAN. 



pared with the gross correlation in table 38. The same comparison for 

 heat-production per unit of body-surface is made in table 39. 



The partial correlations for age and total heat-production for con- 

 stant stature in table 37 show about the same irregularities as the 

 gross correlations. The constants are sometimes lower and sometimes 

 higher than the original coefficients. This failure of correction for 

 stature to make a large difference in the correlations between age and 

 heat-production is to be expected because of the relative laxness of 

 the correlation between stature and heat-production, as demonstrated 

 on page 96. 



TABLE 39. Correlation between age and heat-production per square meter of body-surface and 

 comparison with correlation between age and total heat-production. 



The case is quite different with the partial correlations for age and 

 metabolism for constant weight. With one single exception, in which 

 the difference is small, the constants for the relationship between age 

 and heat corrected for the influence of body-weight are numerically 

 larger than the unconnected values. A careful study of these values 

 shows how greatly correction for body-weight has smoothed the series 

 of constants for the relationship between age and metabolism. They 

 range from 0.350 to 0.576 when the two sexes are considered to- 

 gether, but when the probable errors are taken into account the con- 

 stants can hardly be asserted to differ significantly among themselves. 

 The larger series indicate the medium correlation of 0.5 between age 

 and heat-production for constant weight. 



