BjI. 1090, U. S. Dept. of Agriculture. 



PLATE IV. 



FIG. I.- 



-Male of Family 35, Belonging to the Nineteenth Generation 

 OF Inbreeding. 



Fig. 2. — Female of Family 35, Full Sister of Male Shown Above. 

 Note the Large Amount of Nongenetig Variation in Amount of 

 White. 



Inbreeding has gone further in this family than in any other, possibly because it is above the 

 average in nearly aU elements of vigor. It is much the most resistant to tuberculosis. 



