PLATE 1 



am 



_ 

 iimmr 



mmmmmmmmt 

 mmmmmmmm 



Smmmmmmm*: 



VARIATION IN EXTENT OF PIGMENTATION AMONG CROSS-BRED 



HOODED RATS. 



The usual condition in the original stock is shown in Fig. 4, reduced pigmen- 

 tation in Figs. I and 3, and increased pigmentation in Fig. 2. 



THE MERIDEN ORAVURE CO. 



