GROWTH OF SYSTEMS 



81 



the weight of the dry skeleton after drying in open, but dust 

 free vessels, for thirty days or more at room temperature (17°- 



23°C). 



In table 54 the same material has been used to show the lengths 

 of the femur and tibia and the humerus and ulna together with 

 some simple relations. In the case of the Albinos less than 30 

 days of age, drying in the air may cause so considerable a reduc- 

 tion in the lengths of these bones that no measurements are 

 given in table 54 for dried long bones younger than 30 days — 

 at which time the skeleton is fairly well calcified. 



TABLE 54 

 From some of the same {inbred) Albinos as were used for table SS the lengths of the 

 femur, tibia, humerus and ulna have been determined and also the percentage 

 lengths of the humerus and ulna on the femur and tibia, as well as the relation of 

 both of these pairs to the body length (Conrow, MS '15) 



