29 



ioned for fertility. Possibly environmental factors are of less importance in hatch- 

 ibility than in fertility. Pearl ('00) believes that hatchinp; cjuality is more of an 

 innate eonstitntional character than is fertility. If hatchinjj; (|uality is (lej^-ndent 

 upon Mendelian factors in inheritance, the dejjree of correlation between hatch- 

 :i!)ility of the egss of first-year daufj;hters and th(» e^S^ of second-year daut^hters 

 wonld vary with the number of factors concerned, and with the dcfirce of liomo- 

 /viiosity in tlie males for tliese factors. Should there be a sensil)le ))ositive correla- 

 tion, it would indicate that the male as well as the female transmits hatching power 

 to the offspring. 



In tal)le 7, the group of 51 pairs of daughters studied in secticm is talnilated for 

 hatchability. 



T.uiLE 7. — Correlation in Hatchability between Males' Fird and Second-Year 



Daughters. 



Referring to table 7, the mean hatchability of first-year daughters is. 2965, while 

 the second-year daughters of the same male have a mean of .4484. The difference 

 is .1519=b.0336, which is a significant difference. The second-year daughters 

 appear to be superior to the first-year daughters in hatching power. To draw any 

 conclusion, however, on such meager data would be more than hazardous. The 

 standard deviation does not differ significantly in the two groups of daughters. 



