18 THE GENETIC AND THE OPEBATIVE EVIDENCE 



The game cock is shown in plate 1, figure 1, and plate 4, figure 1. 

 The wattles and comb had been removed from the bird. The yellow- 

 red back and saddle are to be noted. The upper tail coverts and sickle 

 feathers are black, as is the tail. These parts are shorter in the game 

 than in other races, being one of the points selected for. The dorso- 

 anterior edge of the wing is black, this color meeting across the middle 

 of the back. Below this black area comes the red wing bow, followed 

 by a double row of blue-black feathers. The exposed portions of the 

 secondaries are brown, of the primaries black with green margin. The 

 breast and entire lower surface is black. The legs are greenish, the 

 bill black and yellow, the iris yellow. 



The hen of the Black-Breasted game (plate 1, figure 2) is light 

 yellowish-brown. The back, saddle, and wing coverts are golden 

 brown, finely penciled with darker brown or black. The hackle is 

 penciled; it has a yellow border (without barbules); the back is more 

 brown, the forepart of the breast is salmon, the more posterior parts 

 lighter salmon. The sides of the body under and below the wings are 

 stippled gray. 



The Sebright male is represented in plate 1, figure 3. Photographs 

 of the male and the female are given in plate 4 figures 3 and 4. Most 

 of the feathers have a yellow center and a black border. Such feathers 

 are said to be laced. The details of the different regions are shown in 

 the feather plates, 6 and 8. 



A. The Fi Birds. 



The Fi birds were remarkably uniform. The sexual dimorphism 

 is slight, as a comparison of the male and female in plate 4, figures 5, 6, 

 will show. In the female the body feathers are penciled but very 

 mossy, and this holds for the male too, except that in the hackle, back, 

 and saddle, a change in color accompanies the change in shape, as seen 

 in the individual feathers in the feather chart (plate 7, figure 1). If 

 there are any sex-Unked factors involved in the cross, we should expect 

 different types of Fi hens in the direct cross and its reciprocal, because 

 in one case the Fi hen gets her single X chromosome from one father, 

 and in the other case, the reciprocal cross, from the other. Unfortu- 

 nately no careful comparison can now be made, because the crosses were 

 carried out in different years and the changes due to age may have 

 affected the color sufficiently to obscure such slight difference that may 

 have existed. But the effects of such factors, if present, are very small, 

 since the birds seemed to be the same, regardless of the way in which 

 the cross was made. In the F2 counts, although an attempt has been 

 made to keep apart the birds obtained in the two crosses (i. e., the di- 

 rect and the reciprocal crosses), it is very doubtful if the two groups 

 show any significant differences. 



