FERTILITY AND HATCHING OF EGGS. 



133 



TABLE XIII. 



Showing the Correlation betzveen the Hatching Quality of Eggs 

 and Winter (November to March) Egg Production. Hatch- 

 ing Season of ipo8. 



Relation Between Winter Egg Production and Hatching 

 Quality of Eggs. 

 It has been seen that the statistics show no relation between 

 winter egg laying and the fertility of eggs subsequently pro- 

 duced in the breeding season. This result at once suggests the 

 further question as to whether the same thing is true in regard 

 to hatching quality of eggs. Will the hen that has laid heavily 

 during the winter produce on the average more or fewer 

 chickens from a given number of fertile eggs than will a hen 

 that has not laid heavily during the winter? It is apparent that 

 again this is a problem in correlation. A table must be prepared 

 and the correlation coefficient found between the two variables 

 winter (November i to March i) egg production on the one 

 hand, and per cent, of fertile eggs hatched on the other hand. 

 Such correlation tables for the two years 1908 and 1909 are 

 shown in Tables XIII to XVI inclusive. The 1909 data are 

 given in three tables as in preceding cases. 



