GROWTH OF THE SKELETON 



261 



last thirty observations in the original tables (as represented 

 by the last thirty observations in table 1). 



As will be seen, the relative values are given here (Table 

 9) for the fresh bone weights only. The absolute weights for 

 the room dried bones are, however, entered in table 11. From 

 this latter table the oven-dried weights may be obtained, if 

 needed, by using appropriate factors which appear in table 19. 



01 23456 f 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 



Chart 11 Absolute weight of the room-dried limb bones, on the weight of the 

 fresh skeleton (albino rat). Table 11. 



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



B. According to body weight 



The foregoing tables 8 and 9 permit us to compute the prob- 

 able weight of the entire fresh skeleton when the fresh weight 

 of one or more of the limb bones is given. 



While the proportions within the skeleton are probably fairly 

 constant in a series of individuals, it seems possible that the 

 proportion of the total body weight represented by the skeleton 

 is subject to considerable variation. In view of this fact, it is 

 important to know how the weights of. the several limb bones 

 stand in relation to the body weight in a standard series. For 

 this purpose the absolute weights of the fresh, the room-dried, 

 and the oven-dried limb bones on body weight are given in tables 

 12, 13, and 14. Because these relations are useful in determin- 

 ing, for example, the variation in the weight of the skeleton under 



