20 THE GENETIC AND THE OPERATIVE EVIDENCE 



M. Yellow neck, the back, tail, and lower half of each secondary coarsely stippled. Pos- 

 terior part of breast barred; cape and anterior breast penciled. The series of 

 feathers photographed in plate 10, figure 5, from the breast of a bird in class M, 

 shows all possible gradations from a penciled to a barred condition. 



0. 1 cock-feathered, Red-Breasted game with somewhat stippled feathers. The lower half 

 of each secondary is penciled (Hamburg type). 



P. 1 intermediate male with yellow hackle that is black striped. He has a peculiar saddle, 

 the general color of which is reddish brown. Each feather has a faint black edge, 

 and is clear yellow along shaft; the rest of the feather is finely dusted on a yellow 

 background (plate 10, fig. 3). Breast feathers (in front part) are laced with 

 an outer black band edged with yellow. In the posterior region of the breast the 

 feathers are broadly laced. Wing-bow and coverts red, laced with black. The 

 exposed edges of primaries and secondaries are red-brown, the covered parts black. 

 The tail is black. 



Back-Cross Hens. 



A. Two dark Fi types. The breast is between stippled and penciled, the head is black. 

 C. (1) Sebright type. Very dark with much stippling. Some penciling on back. Breast 

 dark; neck like that of Sebright. 



(2) Sebright type like (1), but not such clear yellow. Secondaries and tail feathers 



and coverts stippled (with black tips). 



(3) Yellow Sebright. Neck and breast yellow with black base and tip to feathers. 



Cape, breast, and wings (except bow) penciled to barred. 

 C. to D. (1) Pale yellow, breast spangled, back lightly penciled, tail same. Secondaries 

 yellow and little stippled. Upper web of primaries stippled. 



(2) Breast spangled, rest as in (1). 



(3) Same as (2). 



L. Dark Sebright. Back-feathers broadly laced and a little penciled. Neck black with 

 yellow centers to feathers and yellow edges (reversed Sebright). 



All of the preceding hens except A are in general Sebrights. The 

 last three are pale stippled Sebrights. 



Back-Cross Hen-Feathered Cocks. 



A. One cock like Fi male, but rather paler on back. 



C. Four cocks. Light Sebrights, but spangled, in general, instead of laced. Feathers 



clear, not stippled. 

 G. One black. 



L. Dark Sebright. Back and rump black. Feathers with narrow center, not stippled. 

 Q. Dark Sebright nearer to hen C (1). Thoroughly stippled with game tail. Neck and 



breast dark Sebright. Probably a new class nearer to (C). 

 R. Two cocks. Pale yellow instead of reddish, and much less black than are other yellows. 



No class of hens to match. 1 



In regard to color inheritance the preceding 19 birds are too few 

 to add anything of significance to the other results, except that they 

 serve to emphasize the dominance of the factors making for Sebright 

 coloration. The hen-feathered cocks confirm the other results as to 

 the dominance of the factor or factors in question. 



There can be little doubt that some of these classes are complex. 

 They almost merge into each other and in one part of the body individ- 



1 There is one other bird, not given in the above list, that is pure Sebright except that his legs 

 are yellow. Until I find out by further breeding of the Sebright stock whether yellow legs are 

 present in it, this case must remain doubtful. On the basis of a two factor color-difference one 

 Sebright (as to color) is expected in 16 birds, and one in 64 on a three factor basis. Some 

 Sebrights had been raised along with the back cross, hence the possibility of contamination. 



