1911.] Stable Simple Mendelia n Population. 35 



Table I. 







(AA). 



(Aa) . 



(aa). 



p = 



i \ 



In the non-inbreeding population 

 Offspring of first cousins 16.? = 4 



25 -00 

 28 -12 



50 -00 

 43 -75 



25 -00 

 28 -12 



p = 



2 -162 q \ 



In the non-inbreeding population 

 Offspring of first cousins 16s = 4 



46 -74 

 49-45 



43 -24 

 37-84 



10 -oo 



12 -70 



p = 



3 -4722 \ 



In the non-inbreeding population 

 Offspring of first cousins 16s = 4 



60-27 

 62-45 



34 -27 

 30 -37 



5 -00 

 7-18 



p = 



4? \ 



In the non-inbreeding population 

 Offspring of first cousins 16s = 4 



64 -00 

 66 -00 



32 -00 

 28 -00 



4-00 

 6-00 



p = 



4-7732 I 



In the non-inbreeding population 

 Offspring of first cousins 16s = 4 



68 -35 

 70 -13 



28 '64 

 25-06 



3- 00 



4- 79 



p = 



6-071? J 



In the non-inbreeding population 

 Offspring of first cousins 16 s = 4 



73 -71 

 75 -23 



24-28 

 21 -24 



2- 00 



3- 52 



p = 



9? | 



In the non-inbreeding population 

 Offspring of first cousins 16s = 4 



81 -00 



82 -12 



18-00 

 15 -75 



1 -oo 



2-12 



i> = 



30-62 2 J 



In the non-inbreeding population 

 Offspring of first cousins 16 s = 4 



93 -76 



94 -14 



6 12 



5-36 



o-io 



0-48 



p = 



99? \ 



In the non-inbreeding population 

 Offspring of first cousins 16s = 4 



98 -01 

 98-09 

 98 -13 



1 -98 

 1 -81 

 1 -73 



o-oi 



0-09 

 0-13 



p = 



140-4? i 



In the non-inbreeding population 

 Offspring of first cousins 16s = 4 



98 -59 

 98 -63 

 98 -68 



1 -40 

 1 -29 

 1 -23 



1/20,000 

 12 -7/20,000 

 18 -8/20,000 



p = 



= 999? J 



In the non-inbreeding population 

 Offspring of first cousins 16s = 4 



99 -80 

 99 -8L 

 99 "81 



0-20 

 0-18 

 0-17 



1/1,000,000 

 84/1,000,000 

 126/1,000,000 



It is only for a rarely occurring evil which is recessive that consanguinity 

 will probably have a marked effect. 



8. Prof. Pearson has suggested to me that in order to compare the results 

 obtained with statistical data, it is necessary to determine on the Mendelian 

 hypothesis what percentage of pure recessive individuals, in a population 

 in which there are both consanguineous and non-consanguineous marriages, 

 is the offspring of related parents. 



For the application of this test it is necessary to know what is the 

 frequency with which cousin marriages occur. Tbis frequency, however, is 



