GROWTH OF SYSTEMS 



185 



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. 



The data are for both sexes combined. 



TABLE 125 

 Shows for the series of body weights of the albino rat by Jackson and Lowrey {'12) 

 the absolute weights of integument, ligamentous skeleton, musculature, viscera 

 and remainder determined by the use of the percentage values given in the pre- 

 ceding table 124. 



Correction for sex. For a given body weight the female as 

 compared with the male as a standard has slightly shorter and 

 hghter bones. For a given body length, slightly heavier bones. 

 The exact values for correction cannot be given at present, but 

 in making any allowance for sex, it must be remembered that 

 the table data are for the sexes combined, and hence inter- 

 mediate in value. 



