FERTILITY AND HATCHING OF EGGS. 



117 



TABEE V. 



Shozving the Correlation bctzi'cen Fertility and Hatching Quality 

 of Eggs. Records for Hatching Season of i^og. Yearling 

 Hens only. 





7 









 1 



1 



















P 







BR 



][ 



CO 



Ce 



in 







NT 



s 



1 



I 



in 

 m 



N^FERTILE 



>n 

 ? 'f T 



»i5 10 



lO CO 



in 











1 



t> 



in 







? 

 in 



00 



in 



? 

 







7 



in 



in 







1 











i2 



g 0- 5 

 3 5- 10 

 u 10- 15 

 % 1.5- 20 

 W 20- 25 

 B 25- 30 

 30- 35 

 5 35- 40 



40- 45 

 ^ 45- 50 

 a 50- 55 

 « 55- 60 

 j^ 60- 65 



65- 70 

 % 70- 75 



75- 80 

 ^ SO- S5 

 S 85- 90 

 90- 95 

 a 95-100 

 a 100-105 



1 

 1 

 1 



2 

 1 

 5 



4 

 2 

 4 

 3 

 2 



2 

 1 



1 



2 

 1 

 2 



2 

 2 



1 



1 



1 

 1 



1 



1 



I 



1 

 1 



1 



1 

 1 



1 



1 



1 

 1 



~ 



- 



1 



- 



_ 



- 



- 



1 

 1 



~ 



- 



1 



3 





 1 

 1 

 2 

 

 2 

 1 

 9 

 2 

 8 

 9 

 8 

 5 

 6 

 2 

 2 



1 







1 



Totals.... 



iO 



10 



3 



1 



2 



3 



2 



r 

 



1 



2 











1 







" 











2 











1 



5S 



From 1908 records (Table II) r = — 0.417=1=0.053. Pullets 

 only. 



From 1909 records (Table III) r =: — 0.142=^0.055. Pullets 

 and yearling hens combined. 



From 1909 records (Table IV) r =■ — o. 1 27 =t 0.071. Pullets 

 only. 



From 1909 records (Table V) r = — 0.139^=0.087. Yearl- 

 ing hens only. 



Translated into words these coefficients mean that the records 

 under discussion show in general that there is a definite and 

 significant negative correlation between the percentage of eggs 

 infertile and the percentage of fertile eggs which are hatched. 



It will at once be noted that the coefficients do not show the 

 same value in both years. In the 1908 records the correlation 

 is approximately 42 per cent of perfect correlation. Perfect 

 correlation would indicate an absolute and unvarying relation- 

 ship between the two phenomena. That is to say. if the corre- 



