Bui. 1090, U. S. Dept. of Agricull 



Plate II. 



Fig. I. — Male of Family 13, Belonging to the Eighteenth Generation 



of Inbreeding. 



Fig. 2. — Female of Family 13, Full Sister of the Male Shown Above. 



The heaviest animals and the largest litters come in this family. It is above the average in 

 most other respects but is next to the poorest in resistance to tuberculosis. The large 

 amount of white is characteristic. 



