GROWTH OF THE SKELETON 



257 



INCREASE IN THE WEIGHT OF THE LONG BONES 



A. According to skeleton weight 



If we turn now to the growth of the humerus (2) , the ulna plus 

 radius (2), and to that of the femur (2) and tibia plus fibula (2), 

 it seems best to follow the increase in these bones in weight first 

 in relation to the weight of the skeleton. Tables 8 and 9 give 

 the data for the absolute and relative fresh bone weights on 

 skeleton weight. In charts 9 and 10 the corresponding graphs 

 are drawn. 



Chart 9 Absolute fresh weight of the limb bones, on the weight of the fresh 

 skeleton (albino rat). Table 8. 



X Femur, o Tibia plus fibula. % Humerus. A Ulna plus radius. 



>. 



Growth of Skeleton— Albino Rat 

 Fresh 



Weight of fresh Skeleton 



I I I I II II I I I I II ITTT 



3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 



Chart 10 Relative weight of the fresh limb bones, on the weight of the fresh 

 skeleton (albino rat). Table 9. 



X Femur, o Tibia plus fibula. • Humerus. A Ulna plus radius. 



