I. LIFE PROCESSES 



29 



litter mates of the males whose body weights form the basis 

 of graph 3 in chart 4. 



The relative position and general trend of the graphs in 

 chart 5 are much the same as those in chart 4, but all of them 



TABLE 5 



Showing the increase in the weight of the body with age and the coefficient 



of variation for females in the first and in the tenth generation of captive 



gray rats, also coefficients for a series of stock albino females 



run at a lower level, since in both races of Xorways tin- 

 females, as a rule, are not as heavy as the males at any age 

 period. 



In chart 5 the graph (1) for gray females of tin- first gen- 

 eration runs below either of the other graphs and tends to 1>< 



