SUPERFETATION AMONG MICE. 



277 



PQ 



Q 

 fc 

 O 

 U 



w 



B 

 H 







w 

 M 



H 



a 



H 



H 

 (4 

 M 



H 

 X 



H 



a 



y 



s 

 ^ 



z 



HH 



tn 



M 

 in 



U 



v a '" 

 rj O 



rt Sri.tJ 



c " 

 3^ 



u 



S 







4> O 



o S 



rt ,9 



n 



U 



2 



o 



o JJ "a 



-H o 



-H 



(n 



to 



1) 



LH 

 O 



O O O 



\O 



OO O OO O 



IT) IT) \f> in 



^f 



ON 



\O 



b s b* 



3 3 3 



b 

 3 v 



o 



