184 



GROWTH OF PARTS 



Owing to the completeness of the preparation by the latter 

 method, it was deemed desirable to study the skeleton in this 

 way and some of the data obtained for the cartilaginous skeleton 

 by Donaldson and Conrow ('19) are here introduced. 



(b) Cartilaginous skeleton. Weight of entire cartilaginous skele- 

 ton. Using a 2 per cent solution of the commercial gold dust 

 washing powder ("gold dust washing powder" consists of about 



TABLE 124 



Average percentage weights of integument, ligamentous skeleton, musculature, 

 viscera and remainder. Based on Jackson and Lowrey ('12), table 4- For the 

 corresponding absolute weights see table 125 



45 per cent sodium carbonate, 30 per cent soap powder, and 25 

 per cent water), the skeletons of some 106 Albinos have been 

 carefully prepared at The Institute (Donaldson and Conrow, 

 '19). The animals were reared on a scrap diet. 



The weight of the skeleton is given in relation to the body 

 weight. The value for the body used here is that normal to the 

 body length (see table 144) when the observed body weight is 

 less than that to be expected but the observed body weight 

 is used when that is above the normal for the body length. In 



