33 



Constants calculated from Table 10. 

 Sires' fertility mean .... 

 Sires' fertility standard deviation 

 Sires' daughters' mean fertility . 

 Sires' daughters' standard deviation 

 Coefficient of correlation 



.8761 ±.008522 

 .1060±. 002491 

 .84 16 ±.005599 

 .1685 ±.003959 

 .0244±. 033211 



A difference, amounting to .0345 ±.00661 4, will be observed between the sires' 

 mean fertility and their daughters' mean fertility. This significant difference is 

 easily explained if the same factors are operating to aft'ect fertility of males and 

 females. A wider range of variability in the daughters as compared with their 

 sires, measured by the standard deviation, seems to indicate that there is little or 

 no constancy in fertilit.y between father and daughter. 



No sensible correlation in fertility exists between sire and daughters as table 

 10 show^s. In the face of this fact, there is no e\adence that factors for fertifity 

 are transmitted from sire to daughter. In other words, fertility does not seem 

 to be an inherited trait that is transmitted from parent to offspring, as has already 

 been shown in both tables 4 and 10. 



Section 11. Relation of Sire's Average to Daughters' Individvxil Hatchability. 



The same group of birds used in table 10 is correlated in table 11 to study the 

 relationship between sire and daughters in hatching power. 



Table 11. — Correlation in Hatchability between Sires' Mates and Sires' Daughters. 



