FERTILITY • AND HATCHING OF EGGS. 



131 



TABEE XII. 



Showing the Correlation between Fertility of Eggs and Winter 

 (November to March) Egg Production. Hatching Season 

 of ipop. Yearling Hens only. 



Tables IX to XII inclusive. These tables have been con- 

 structed by taking for each one of the birds under discussion 

 the sum of the eggs laid by her in the months of November, 

 December, January and February (winter egg-production) as 

 one variable and the percentage of infertile eggs out of the total 

 number of the same bird's eggs set during the hatching season 

 as the other variable. Table IX gives the data for 1908 and 

 Tables X, XI and XII those for 1909. Just as before the 1909 

 data are given first for pullets and yearling hens combined and 

 then for each of these groups separately. 



