DESCRIPTION OF PLATES. K)7 



Plate 4. 



Fig. 1. One of the original Black-Breasted Game males used in the breeding eanerimi 



Compare with colored drawing, plate 1, figure 1. 

 Fia. 2. A Black-Breasted Game hen used in the breeding experiments. CompSTC 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 origin.il 



experiments. He is typical of his breed. 

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

 Fig. 5. An Fi male. This bird had just reached maturity and was younger than the one 



drawn in plate 2, figure 1. 

 Fig. 6. An Fi hen of the same age as the last. The pattern changed a little as the hir-1 



became older. 



Plate 5. 



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 v. hiell the 



drawing, plate 1, figure 4, was made. It is the lighter colored bard refemd 



to in the text. 

 Fig. 3. One of the two Fi 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 ! 



feathering, as the figure shows especially in the hackle and saddle. The 



details are much better shown in the feathers photographed in plate 8, Ggurefl 



1, 2, 3, 4, la, 2a, 3a, 4a, 16, 26, 36, 46. 

 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. 



Plate 6. 



Figs. 1, 1a. Typical old (1) and new (la) feathers (after castration) of the same bird. This 

 is the "fighter" 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 develop 

 Legend on plate 6 erroneous as far as 2 and 2a are concerned. 



Plate 7. 



Figs. 1, 1a. Typical old (1) and new (la) (after castration) feathers of an Fi 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). 



Plate 8. 



Typical feathers of "dark" Sebright (1, 2, 3, 4) that after incomplete castration ehonfed to 

 cock-feathering (la, 2a, 3a, 4a), then later, as pieces of the testei that had ! 

 left behind in the old situs regenerated, began to go back toward- hen- 

 feathering (16,26, 36, 46). The bird was then opened .main, and the re^-n. r- 

 ated pieces removed, when it again became cock-feat bend (1«, 26, 3c, 4c), 

 and has so remained for more than a year. 



