THE PROBLEM OF INBREEDING 115 



TABLE 1 



Values of the Successive Coefficients of Inbreeding 

 (Z to Zi 5 ) in the Case of the Most Intense In- 

 breeding Possible (Brother X Sister out of 

 Brother X Sister — Continued) 



during ten generations of brother X sister breeding, 

 it is extremely improbable that any effect will be 



1 There is, of course, no further point in the retention of all the 

 decimals in these coefficients than to make plain the law of their 

 formation. In the case of maximum inbreeding here illustrated, the 

 Z's are the successive terms of a series in which any term is equal 

 to the preceding term plus one half the difference between the pre- 

 ceding term and 100, or in which the successive differences are halved. 



