362 MAINK AGRICULTURAL EXP^RIMliNT STATION. I912. 



B.P.R. s 559 (fhU fhU) X C.T.G. 5 2 of type fUh. Fhh 



A. fhL^. FL^h-Wmtev recoru over 30 



and 



B. fliL'2. Flih-Winter record under 30 



Male 576 was mated only wi'th 9 2 of the A class/* namely 

 those having a gametic constitution fLL-.. FL.M, and producing 

 two sorts of F-bearing gametes, FhU and FL^li. 



This same $ 576 was mated with non-barred (black) F^ 

 females which had been produced in the following way. 



C.I.G. $ 558 ] 



I 



I 



529 (//,■./.. fhU) J 



B.P.R. $ 2 some of which 

 Avere of type fL-sL^. Fhh, 

 and some fhl-^. FL^h (both 

 producing /^-bearing gam- 

 etes of two kinds FL-^h 

 and Fhh. 



A. jIaU. FIJ2, Winter record under 30 



B. fUU.. FLd2, Winter record under 30 



C. fL^lu FU2, M^inter record under 30 



D. fUli Fhh, Winter record zero. 



The three non-barred 2 2 with which $ 576 was bred were 

 of the B-C type, producing two kinds of F-bearing gametes, 

 FL1I2 and Fhh. They were thus identical, so far as concerns/'""- 

 bearing gametes with the barred F^ birds with which $ 576 

 was mated. All the progeny may then be treated together since 

 all did, as a matter of fact, lead to the same result, having re- 

 gard to the errors of sampling in such statistically small lots. 



" It would of course be desirable to have data from the other mating,. 

 ^ 576 X B $ $. If (5ne could have foreseen what the mechanism of the 

 inheritance of fecundity was going to turn out to be, such matings 

 would have been made. Actually these cross bred birds were being 

 studied primarily with reference to color characters, and the matings 

 were made relative to that line of investigation. Naturally highly 

 fecund females would be chosen as breeders whenever possible, in order 

 to get more chickens for the color studies. Actually, however, all of 

 the possible gametic combinations in respect to fecundity were tested in 

 F2 either from one mating or another. 



