Fig. 1. F1 hen-feathered male out of Game by Sebright. The hen-feathering in this bird is as complete as in the Sebright.

Fig. 2. F1 female out of Game by Sebright.

Fig. 3. Castrated male originally hen-feathered (292), nearly black in color, as shown by the individual feathers of plate 7, figure 2. After castration the bird has become red above, with black iridescent tail-coverts, and deeper yellow (or red) below.

Fig. 4. Castrated F1 male, originally like figure 1. Note especially the change in color of the whole upper surface that has become red, like that of the jungle-fowl. The tail-coverts have grown long and are now iridescent black. The breast has changed least, but is a richer yellow. The comb and wattles and ear lobes are shrunken, as in all capons.

Fig. 1. A castrated Sebright male. The operation was performed on a juvenile bird; the drawing was made a year later. The bird is typical as to the change in color that takes place in the Sebright. He was darker red than the bird shown in plate 1, figure 4. The red was more mahogany than the picture shows. The original feathers were like those in plate 6, fig. 2 (there erroneously referred to as those of light-colored Sebright).

Fig. 2. An F2 hen-feathered very dark male. The condition of his plumage at the time of the operation is shown in this figure. The change that took place after castration is shown in the next figure.

Fig. 3. The change that took place in the bird drawn in figure 2 is shown here. The whole upper surface has become red, except the tail-coverts, which are iridescent black. Note also the change in color on the wing-bow. For the details of the feathers see plate 9, figures 1, 1a.

Fig. 4. A castrated F2 bird that had been hen-feathered and had changed over to cock-feathering, as shown here. The color and the details of the original hen-feathering are shown in plate 9, figures 2 and 2a.

Fig. 1. One of the original Black-Breasted Game males used in the breeding experiments. Compare with colored drawing, plate 1, figure 1.

Fig. 2. A Black-Breasted Game hen used in the breeding experiments. Compare with colored drawing, plate 1, figure 2.

Fig. 3. A Sebright male. The bird was used in the later back-crosses and not in the original experiments. He is typical of his breed.

Fig. 4. A Sebright female. One of the birds used in the original experiments.

Fig. 5. An F1 male. This bird had just reached maturity and was younger than the one drawn in plate 2, figure 1.

Fig. 6. An F1 hen of the same age as the last. The pattern changed a little as the bird became older.

Fig. 1. An adult Sebright male for comparison with the next figure.

Fig. 2. A castrated Sebright male. This photograph shows the same bird from which the drawing, plate 1, figure 4, was made. It is the lighter colored bird referred to in the text.

Fig. 3. One of the two F1 castrated birds. For comparison see the colored drawing in plate 2, figure 4.

Fig. 4. A castrated Sebright. This bird is darker, and in this sense more typical than figure 2.

Fig. 5. One of the castrated Sebright males which at one time after castration was as extremely cock-feathered as figure 2, but slowly “went back” towards hen-feathering, as the figure shows especially in the hackle and saddle. The details are much better shown in the feathers photographed in plate 8, figures 1, 2, 3, 4, 1a, 2a, 3a, 4a, 1b, 2b, 3b, 4b.

Fig. 6. The same bird was opened and the regenerated pieces of the testis removed. He returned later, as shown here, to full cock-feathering.

Figs. 1, 1a. Typical old (1) and new (1a) feathers (after castration) of the same bird. This is the “lighter” male drawn in plate 1, figure 4, and photographed in plate 5, figure 2.

Figs. 2, 2a. Typical old (2) and new (2a) (after castration) feathers of another Sebright. This bird developed after castration darker feathers than did the last bird. Its feathers were more like those that other castrated Sebrights developed. Legend on plate 6 erroneous as far as 2 and 2a are concerned.

Figs. 1, 1a. Typical old (1) and new (1a) (after castration) feathers of an F1 bird. (See plate 2, figures 1 and 4.)

Figs. 2, 2a. Typical old (2) and new (2A) (after castration) feathers of bird shown in plate 3, figures 2 and 3 (No. 292).

Typical feathers of “dark” Sebright (1, 2, 3, 4) that after incomplete castration changed to cock-feathering (1a, 2a, 3a, 4a), then later, as pieces of the testes that had been left behind in the old situs regenerated, began to go back towards hen-feathering (1b, 2b, 3b, 4b). The bird was then opened again, and the regenerated pieces removed, when it again became cock-feathered (1c, 2c, 3c, 4c), and has so remained for more than a year.

Figs. 1, 1a. Typical feathers of hackle and saddle from hen-feathered bird (No. 68) plate 3, figure 2, that changed over to the cock-feathered bird of plate 3, figure 3.

Figs. 2, 2a. Typical feathers of an F1 male (2) that changed over partly as a result of degeneration of his testes, into a cock-feathered bird (2A). The change was not so great as it is after castration.

Figs. 3, 3a. Typical feathers of Sebright male that slightly changed towards cock-feathering (old hackle feather missing).

Figs. 1, 1a. Old (1) and new (1A) wing-coverts of normal Sebright (1) and castrated (1A).

Figs. 2a, 2b. Upper row, to right, “Transitional” hackle feathers (2A), and a slightly later changed-over feather from wing-bow (2A), and from back (2B). Second row, to left, old (2), transitional (2a), and changed-over feather (2b), from saddle of Sebright.

Fig. 3. Three feathers (tail-covert, wing-bow, and saddle) of an F2 hen-feathered game-like male.

Fig. 4. A series of breast feathers from an F2 bird. At one end of the series (the left) the feather is spangled, at the other barred.

Fig. 5. A series of breast feathers from another F2 bird. At one end of the series (the left) the feathers are penciled, at the other end they are barred.