3. Feathers of back are red except for black at base. Barbules absent at end and side. Tip pointed. 4. The saddle feathers are red with black base. They are long and pointed. 5. The coverts are blue-black, with brown shaft. They are long, pointed, and curved. 6. The tail feathers are black, not stippled, and have a black shaft. 7. The wing-bow feathers are red with black base. 8. Over the crop the feathers are orange-brown; on the breast they have the same color and a small black tip. The F₁ bird from which the colored drawing (plate 2) was made and from which the normal F₁ feathers were pulled was lent to Dr. Goodale in the summer of 1917. The bird died in April 1918, and his skin was sent to me. He also had begun to change over to cock-feathering (plate 9, figures 2, 2_a_). Goodale recorded that the testis had dwindled to small bodies only about 10 by 5 mm. This accounts for the change to cock-feathering. For comparison I have added a third set of feathers to the two former sets, showing the new hackle, back, saddle, wing, and bow feathers of this bird. The feathers show that the change is in the same direction as that shown by the castrated cock, but it has not gone so far in the direction of cock-feathering. The tail is still short and the feathers are black. The sickle feathers are not longer than the tail and are stippled. It is probable that this is the old tail whose feathers have not been molted since the testis dwindled. In fact, elsewhere the old and the new feathers are both present, showing that a complete molt had not taken place. The old feathers still present are practically like those of the original F₁ bird, showing that the change was of recent date, and due to the decrease in the testis which was probably caused by disease. CASTRATION OF F₂ HEN-FEATHERED MALES. The F₂ hen-feathered males from this cross could not be utilized until they had begun to assume the adult plumage, since before that time they were like the cock-feathered F₂ males. Consequently, the operation is more difficult and more dangerous to the bird. A good many birds have died in consequence of the operation, but enough successful operations (five) were made to show what the color of certain types of hen-feathered bird would be when changed to cock-feathering.