In all of Mr. Whittaker's experience with this flock he has never known of more than one egg being deposited. Audubon, in his article on the Passenger Pigeon, says: "A curious change of habits has taken place in England in those pigeons which I presented to the Earl of Kirby in 1830, that nobleman having assured me that, ever since they began breeding in his aviaries, they have laid only one egg." The eggs are usually laid from the middle of February to the middle of September, some females laying as many as seven or eight during the season, though three or four is the average. The period of incubation is fourteen days, almost to a day, and, if the egg is not hatched in that time, the birds desert it. As in the wild state, both parents assist in incubation, the females sitting all night, and the males by day. As soon as the young are hatched the parents are fed on earth worms, beetles, grubs, etc., which are placed in a box of earth, from which they greedily feed, afterwards nourishing the young, in the usual way, by disgorging the contents from the crop. At times the earth in the inclosure is moistened with water and a handful of worms thrown in, which soon find their way under the surface. The pigeons are so fond of these tid-bits they will often pick and scratch holes in their search, large enough to almost hide themselves. When the birds are sitting during cold weather, the egg is tucked up under the feathers, as though to support the egg in its position. At such times the pigeon rests on the side of the folded wing, instead of squatting on the nest. During the first few days, after the young is hatched, to guard against the cold, it is, like the egg, concealed under the feathers of the abdomen, the head always pointing forward. In this attitude, the parents, without changing the sitting position or reclining on the side, feed the squab by arching the head and neck down, and administering the food. The young leave the nest in about fourteen days, and then feed on small seeds, and later, with the old birds, subsist on grains, beech nuts, acorns, etc. The adults usually commence to molt in September and are but a few weeks in assuming their new dress, but the young in the first molt are much longer. At the time of my visit the birds were all in perfect plumage. The young in the downy state are a dark slate-color.