1910.] ima Mendelian Population Mating at Random. 55 
values of the ancestral gametic correlations in a Mendelian population 
obtained from theoretical considerations were in close accordance with those 
determined for the somatic characters in biometric researches, while the 
somatic correlation on the Mendelian hypothesis appeared to be too low, if 
the principle of absolute dominance was maintained. The results of the 
present paper for the sibling, avuncular and cousin correlations agree equally 
well with the statement made for ancestral correlations. The general 
1 pt+8q 
16 p+2¢97’ 
general somatic grandparental and avuncular correlations. The conclusion of 
somatic correlation for cousins, viz., is always greater than the 
Miss Elderton that “cousins must be classed as equally important with 
uncles and aunts, and they may eventually turn out to be as important as 
grandparents,” paradoxical as it appears, 1s supported by the theory of 
Mendelism as well as by biometric experience. Without making any 
dogmatic assertion, it seems safe to conclude, both from theory and practice, 
that the cousin ranks in no way behind aunt or uncle and grandparent_in 
family resemblance. The importance of this deduction in medical diagnosis 
has already been indicated. 
In conclusion I have to thank Prof. Pearson for considerable advice while 
the work in connection with this paper has been in progress. 
