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THE AMERICAN NATURALIST [Vol. XL VII 



nates their own ancestors. Thus the bull Hamlet first 

 appears in the third ancestral generation as the sire of 

 Sheba. He next appears (here marked with a solid circle) 

 in the fourth generation as the sire of Salome. He will, 

 by the general rule for coefficients of inbreeding, not be 

 counted as a " different ' ' ancestor in the fourth genera- 

 tion. But this automatically eliminates his two parents in 

 the fifth ancestral generation, his four grandparents in 



TABLE IV 



Working Table used in calculating the Coefficients of Inbreeding 

 for Pedigree Table VII 



