GROWTH OF SYSTEMS 



79 



those for the stock, when both age and body weight are taken into 

 consideration. 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 68) 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 the case of old rats undergoing senile loss of body 

 weight the maximum body weight is the one used. 



The weight of the teeth is included with that of the skeleton 

 — but the weight of the nails is excluded. Under these condi- 

 tions the following table gives the weight of the moist carti- 

 laginous skeleton — immediately after complete cleaning, and also 



TABLE 53 



Giving data on the cartilaginous skeleton of the (inbred) Albino (Conrow MS '15). 

 The weights for the moist skeleton are given — but not for the room dried skeleton. 

 The percentage values for both on the body weight have been computed. 



