BODY LENGTH BODY WEIGHT 



203 



same way. These measurements give first the total length, 

 second, the body length and by the difference, the tail length. 



Chart 27 gives the body length on the body weight. The data 

 used are given in table 144. The values were computed by 

 formula (4) and then corrected for each sex. The graphs show 



Chart 27 Giving for the males and females respectively the body length on 

 the body weight. Formula (4) : table 144. 



that for a given body weight the male has the greater body 

 length. Donaldson '09; Donaldson and Hatai '11. 



Body weight on body length. The entire rat was next weighed 

 to one-tenth of a gram. The weight thus obtained was not 

 corrected for the contents of the alimentary canal which accord- 

 ing to Jackson and Lowrey ('12) amounts to about 5 per cent 

 of the "gross" body weight. The uncorrected value is the gross 

 body weight and the corrected, the "net" body weight of the 



