GROWTH IX BODY WEIGHT 



177 



Finally at The Institute, King ('15 a) has conducted two series 

 of observations (1912-1913) (1913-1915) on the increase in body 

 weight with age in stock Albinos. There were 23 males and 

 23 females in the first series and 27 of each sex in the second. 

 The records for the two series have been combined. The obser- 

 vations extend from 13 -485 days and the weighings were made 



TABLE 120 



Data on thirteen litters of stock albino rats, showing the increase in the weight of 



the body with age 



at the ages given in table 120. These rats received a "scrap" 

 diet (i.e., a diet composed of selected table scraps). 



In chart 21 the record for the males is given by graph B and 

 in chart 22 the record for the females by graph B. 



Table 121 gives also the coefficient of variation in body weight 

 for each sex. 'The average value for the coefficient of variation 

 is for males 13.6 and for females 12.1. In table 141 the frater- 

 nal variability for each sex is recorded. As there shown, the 

 fraternal variability is for both sexes less than that for the 

 general population. 



