VARIATION: CAGED NORWAY 



345 



somewhat more variable than the males, but in the adult state the 

 males tend to be more variable. 



TABLE 186 



Showing the coefficients of variation with their probable error for the body weights at 



different ages of a series of Norway rats (51 males and 59 females), and of a 



series of stock albino rats (50 males and 67 females) . 



Norway rats at all age periods are much more variable in body 

 weight than are albino rats (table 186). 



