30 



C. M. JACKSON 



mately 2:1, which does not change appreciably according to age. 

 The variabiUty in absolute weight of right and left lungs taken 

 separately, is about the same as for both together, as shown by 

 table G. 



TABLE G 



The coefficient of correlation between the body weight and 

 weight of lungs, including right and left lung separately, is given 

 in table H. While the coefficients are too high (due to 'spurious 

 correlation') those at any given age may be safely compared with 

 each other. 



TABLE H 



Coefficient of correlation between the lungs and the net body weight (sexes together) 



From this table it is evident that the correlation between body 

 weight and right lung is practically the same as between body 

 weight and both lungs; and that the correlation between body 

 weight and left lung is usually but slightly less. These figures 

 show no evidence of the existence between the right and left 

 lungs of any compensatory regulation in size, for deviations 

 within the limits of normal variation. This question may be 

 complicated by other factors, however, so that it is unsafe to 

 draw any definite conclusion regarding the matter. 



