Bui. 1090. U. S. Dept. of Agriculture. 



Plate V. 



Fig. I. — Male of Family 39, Belonging to the Thirteenth Generation 



of Inbreeding. 





£&. 



1 



. • - : ^/~- 







ifalfratu^ '^!!3*' , ^^^^^^"i^»^^ 



r, 



w 









Fig. 2.— Female of Family 39, Full Sister of the Male Shown Above. 

 The Small Amount of White and the Sway Back Are Character- 

 istics Fixed in this Family. 



Other characteristics are the greatest success in bearing young alive, but lack of success 

 in rearing them, irregularity in producing litters, and the greatest susceptibility to 

 tuberculosis. 



