HEREDITY 



507 



Here we have, after one indiscriminate mating all around, a 

 total of nine animals, of which one is pure black, one pure red, 

 and one pure white, with the other six divided into three 

 groups, each of two colors combined, that is, all the pos- 

 sible combinations. 



If now this generation be bred into itself, new and strange 

 combinations are inevitable, giving rise to a complicated popula- 

 tion, as follows : 



TABLE OF OFFSPRING SHOWING THE FOURTH GENERATION IN THE 

 ATTEMPT TO COMBINE THREE CHARACTERS 



DAM^ 



SIRES OF SAME BREEDING AS DAMS 



B'* 



2 BR 



zBW 



2 WR 



2BR 



2BW 

 2RW 



&JP 



2BR* 



2BR* 



2 B& W 



2BRW* 



2BRW* 



2BW* 



4 

 2RW* 



2BW* 

 2RW* 



B* + 4 B*R 

 + \2BRW* 



+ 4 



12 &RW '+ 



+ 4 



+ 12 BR*W 

 *, total, 81 



Here are eighty-one individuals of no less than fifteen differ- 

 ent color combinations, all effected within two generations from 

 purity. Out of the eighty-one individuals, three, and three only, 

 are as pure as if no admixture had been attempted, suggesting 

 that a certain small proportion will ahvays remain unmixed in 

 heterogeneous breeding, no matter Jiow long continued. 



