HUMERUS AND FEMUR 



317 



With regard to the data in this table 176 Hammett ('23 g) 

 makes the following comment : 



At 100 days of age the percentage value of calcium, magnesium, 

 and phosphorus of the humerus ash is practically the same as that of 



TABLE 174 



The statistical data of the gross chemical composition of the hximerus and femur 



of the normal male rats in terms of fresh weight at two ages 



FRESH 

 WEIGHT 



DRY 

 WEIGHT 



H2O 



ORGANIC M.iTTER 



100 days of age, 11 rats 

 Humerus 



M 



S. D 



P. E. M 

 C. V 



per cent 



37.81 

 1.93 

 0.39 

 5.10 



Femur 



M 



S.D 



P. E. M 



35.58 

 2.87 

 0.58 

 8.05 



150 days of age, 11 rats 

 Humerus 



M 



S.D 



P. E. M 

 C. V 



42.85 

 2.41 

 0.49 

 5.62 



Femur 



the femur, notwithstanding the markedly heavier ash and greater abso- 

 lute amount of the three constituents in the latter. There is, however, 

 a slight but valid superiority in the percentage of phosphorus exhibited 

 by the femur. Since this is present in both sexes, and is shown in all 

 the groups, it is undoubtedly significant. 



