On Nutrition and Sex-determination in Man. 



269 



this it is evident that any artificial restriction of the family will 

 tend to increase the proportion of male infants. And here a 



Table VI. 



possible source of error must be noticed. The proportion of ,/s 

 to $s in the table given is extremely high (i.e. 1133 ^s to 100 

 $ s), even when allowance is made for a low death-rate of male 

 infants owing to favourable conditions of existence here. In 

 Burkes Peerage the dates of birth of each member are given 

 in rather more than half the families. For comparison with these 

 the children born of 360 marriages, whose dates of birth were 

 omitted, have been considered. The table brings out the com- 

 parison between the two sets. 



Table VII. 



* These are the same as in the preceding table (Table VI) except that 103 single 

 child families have been omitted. Set 1 and Set 2 contain only families with two 

 or more children. 



VOL. XII. PT. IV. 18 



