GENETIC STUDIES IN POULTRY. 



231 



Families of 10 and over 48.57 0.28 



Families of 4-9 inclusive 49-39 0.84 



Families of 1-3 inclusive 55-O7 2.11 



Families of 4 and over 48.80 0.33 



Families all sizes 49-45 



It becomes apparent from these figures that the smaller families 

 are more likely to show extreme values of the sex ratio. In fact, 

 according to Pearl, ratios above 80 and under 20 occur very rarely 

 in families of ten or more. 



The ratio of males for different colonies in the present experi- 

 ment together with the number of hens in each colony is shown 



in Table IV. 



TABLE IV. 



THE SEX RATIO FOR THE DATA SHOWN IN TABLE II. LISTED ACCORDING TO 



BREEDING AND COLONIES. 



The range in the data is from 46.91 in the smallest colony with 

 a total of five birds to 56.87 per cent, males in a colony with 

 fifteen birds. The average sex ratio for all colonies is 51.63. 



