206 



NATURAL INHERITANCE. 



Table 9. 

 Marriage Selection in REsrECT to Stature. 



The 205 male parents and the 205 female parents are each divided into three 

 groups — T, M, and S, and t, on, and s, respectively — that is. Tall, Medium, and 

 Short (medium male measurements being taken as 67 inches, and upwards to 70 

 inches). The number of marriages in each possible combination between them 

 were then counted, with the result that men and women of contrasted heights, 

 Short and Tall, or Tall and Short, married about as frequently as men and women 

 of similar heights, both Tall or both Short ; there were 32 cases of the one to 

 27 of the other. 



S., t. 

 12 cases. 



M., t. 

 20 cases. 



T., t. 

 18 cases. 



S. , m. 

 25 cases. 



M.;m. 

 51 cases. 



T, m. 



28 cases. 



S., s. 

 9 cases. 



M., s. 



28 cases. 



T., s. 

 14 cases. 



Short and tall, 12 + 14 = 32 cases. 

 Short and short, 9 1 _ 

 Tall and tall, 18 



V = 27 cases. 



We may therefore regard the married folk as couples picked out of the general 

 opulation at haphazard when applying the law of probabilities to heredity of 



1 . 

 stature. 



Table 9a. 



Marriage Selection in respect to Eye-Colour 



in 78 Parental Couples. 



Eye Colour of 



No. of 



cases 



observed. 



Per Cents. 



Eye Colour 

 of Husband 

 and Wife. 



Husband 



Wife. 



Obs. 



Chance. 



Observed. 



Chance. 



Light 

 Hazel 

 Dark 



Light 

 Hazel 



Hazel 

 Dark 



Light 

 Dark 



Light 

 Hazel 

 Dark 



Hazel 

 Light 



Dark 

 Hazel 



Dark 

 Light 



29 

 2 

 6 



} » 

 i * 



37 

 3 



8 



23 

 5 



24 



37 



2 

 7 



15 



7 

 32 



J- 48 



[ 28 

 24 



46 

 22 

 32 



Alike 



f Half-con- 

 \ trasted 



Contrasted 



The chance combinations in pairs are calculated for a population containing 

 61-2 per cent, of Light Eye-colour, 127 of Hazel, and 261 of Dark. 



