inheritance; of fecundity in domestic eowIv. 317 



In spite of the comparatively small number of individuals 

 here, the evidence of segregation of high and low fecundity in 

 accordance with gametic expectation is clear and indubitable. 



B.P.R. $ jj2. Indicated gametic constitution — fliL-^. fUL--. 



This male was used as a breeder during two seasons (1909 

 and 19T0). He was hatched in the spring of 1908. His sisters 

 were very poor winter layers, as shown by the following table.. 



Winter production 

 as pullets 

 Sisters of <S 552 Eggs ■ 

 E 184 16 

 E 229 6 

 • E 272 7 

 Mean winter production of family 9.67 



The mother of $ 552 ( $ D725) was a good layer v/ith a win- 

 ter record of 61 eggs. From her he evidently got an L2 factor 

 which his sisters could not acquire in this way. The father was 

 heterozygous relative to L2 (belonging to class 4) and the only 

 one of his adult progeny from the mating with 5 1-^7^5 to bear 

 iv2 happened to be the $ 552 here under discussion. In the 

 following account of $ 552's breeding history the progeny in 

 both of the years in which he was used in the pens are taken 

 together. There is no reason why the two years should be dealt 

 "with separately. 



Matings: A. With 4 $ ? indicated to be of class 2 = fLxLt- PL J-,. 

 5 Progeny 



Winter Production: Over 30 Under 30 Zero 



Observed iii J o 



Expected 12 



Mean winter production of ? ? 



in indicated class 48.27 eggs 



B. With ID 2 ? indicated to be of class i ~ fL^L,. Fl,L. 



5 Progeny 



Winter Production: Over 30 Under 30 Zero 



Observed 17 15 ' 2 



Expected 17 17 



Mean winter production of ? ? 



in indicated class 54-71 eggs 12.47 eggs eggs 



