246 H. D. GOOD ALE 



traces of light head stripes. She has some white primaries. 

 The under side of her wings instead of being white are Ug-ht brown 

 with darker markings. The speculum is obscured, apparently 

 by. being overlaid with black pigment. The bill is nearly black 

 with greenish cast. The feet contain much black in addition 

 to the normal orange. The occurrence of similar black ducks has 

 been noted in two other flocks composed of Pekins and Rouens. 



THE F2 GENERATION 



The F2 generation is a motley assemblage. Unfortunately 

 many of the young managed to lose their leg bands so that the 

 exact parentage of each individual in not known. Consequently 

 this generation will have to be considered as a whole, except in 

 the case of pigmented and non-pigmented down, which is given 

 in connection with the description of each mating. The adults 

 are considered under a separate heading. 



A record of the down plumage of each duckling was made at 

 hatching time. The only correlation between down and adult 

 plumage, about which there is no doubt, is that existing between 

 yellow ducklings and white adults. There are several types of 

 down among the pigmented ducklings, but their relation to the 

 various types of pigmented adults is entirely unknown, so that the 

 down records only enable us to separate pigmented from non- 

 pigmented individuals. 



Fi matings and down color. Two pens of Fi were mated. In 

 one a drake from a Pekin female by Rouen male was placed with 

 two of his sisters. Their eggs did not hatch well and only nine 

 young were produced. Six had pigmented down and three 

 yellow down. 



In the other pen was placed a drake, derived from a Rouen 

 mother and Pekin father, wdth one of his sisters and the Fi black 

 duck with white breast. From the first duck there were five pig- 

 mented and four yellow ducklings; from the black duck there 

 were seven pigmented and three yellow ducklings. 



Altogether there were twenty-nine F2 ducklings from these two 

 pens, nineteen were pigmented and ten yellow. If the black 



