No. 632] 



SABLE VARIETIES OF MICE 



2*3 



gree of the F 1 agoutis resulting from the inbred F x yel- 

 lows and of the progeny of the inbred F 2 agoutis. In the 

 latter class strong evidence of the segregation of the un- 

 darkened wild is apparent from the large size of grade 1 



Yellow 



Pi 







x * ■ * * t 



Agouti X 



r, - 





MfCroM^ yellow 



X w,U 



15C 



* wild 



["V 



