120 MODES OF RESEARCH IN GENETICS 



TABLE 2 



Values of the Successive Coefficients of Inbreeding 

 in the Case of Continued Parent X Offspring 

 Mating 



There are, of course, two possible sorts of first 

 cousins, single and double. In the first case one of 

 the parents of any individual is a brother (or sister) 

 to one of the parents of the other individual in 

 the mating. In the second case both the parents 

 occupy this relation to the parents of the other 

 individual in the mating. 



These two sorts of first cousinship are shown in 

 Pedigree Tables III and IV. 



