66 



BIOLOGY OF THE LABORATORY MOUSE 



w 

 i-i 

 o 



O 



H 

 in 



w 

 W 



H 

 O 



s 



1:3 



Q 



w 



H 



o 



O 



M u 

 t> 



Q 

 O 

 PS 

 a, 

 W 



Pi! 

 w 



H 



W 

 O 



u 



o 

 w 



1-1 



H 



o 



< 



w 

 w 



o 



C/2 



