254 



HENRY H. DONALDSON 



both the proximal and the middle segments show the same rel- 

 ative increase in weight, between the terminal values, while in 



M 1 1 1 M 1 1 1 1 



Growth of Skeleton— Albino Rat 

 Fresh 



1.0 



Carpus plus Foot Bones 



1.7 



Weight of Bone* of For* Inntre 



M I I I I I I I I I I I I I I I I I IT 



1.4 



1.6 



IB 



Chart 7 Relative fresh weight of the fore-limb bones, on the weight of all the 

 bones composing the fore limb (albino rat). Table 6. 



• Humerus. A Ulna plus radius, x Carpus plus foot bones. 



35 

 30 

 25 

 20 

 15 



Growth of Skeleton— Albino Rat 

 Fresh 



1.0 



1.5 



2.0 



2.5 



3.0 



Tarsus plus Foot Bones 



Weight of Bones of Hind limbs 



3.5 



4+JTT+fr-rlrTrrrTfTTffl 



4.0 



4.5 



Chart 8 Relative fresh weight of the hind-limb bones, on the weight of all 

 of the bones composing the hind limb (albino rat). Table 7. 

 • Femur, a Tibia and fibula, x Tarsus and foot bones. 



the hind limb the greater increase is shown by the proximal seg- 

 ment, the femur. 



The first column in both table 6 and table 7 gives the body 

 weights to which the respective bone weights correspond. 



