186 RAYMOND PEARL 



B.P.R. cf 55S. Indicated gametic constitution = fliL2 . fkL^. 



This male was hatched in the spring of 1908 and used as a 

 breeder in the season of 1909. His successful 'pure' matings (i.e., 

 those with B.P.R. females which produced adult female progeny) 

 were as follows: . 



Matings: A. With 6 9 9 indicated to be of class 2 = /L1L2 . FLdi- 



9 Progeny 



Winter Production: Over 30 Under 30 Zero 



Observed 15 



Expected 15 C 



Mean winter production of 9 9 



in indicated class 51 .33 eggs 



B. With 3 9 9 indicated to be of class 1 = fLiL : . Fhh. 



9 Progeny 



Winter Production: Over 30 Under 30 Zero 



Observed 6 9 



Expected ' 7.5 7.5 



Mean winter production of 9 9 



in indicated class 55.50 eggs 13.56 eggs 



C. With 2 9 9 indicated to be of class 4 = JLiU ■ FLih. 



9 Progeny 



Winter Production Over 30 Under 30 Zero 



Observed 4 



Expected 4 



Mean winter production of 9 9 



in indicated class 39.75 eggs 



All 9 Progeny 



Winter Production: Over 30 Under 30 Zero 



Observed 25 9 



Expected 26.5 7.5 



Mean winter production: 50.48 eggs 13.56 eggs 



The agreement between observation and expectation here is 

 as close as could be expected considering the numbers involved. 

 Further it is evident from the mean production of the daughters 

 falling in the several classes that the 'Over 30' and 'Under 30' 

 classes are perfectly distinct in respect to degree of fecundity. 



