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.