The parent birds take all the trouble and responsibility of feeding and raising the young right up to the time they are ready for market. The hen-bird lays two eggs, with one day intervening, which take eighteen days to incubate. After the eggs are hatched, both birds devote their entire energies to feeding the youngsters for about two weeks, for both have the power to secrete the predigested substance often called pigeon’s milk, on which nestlings are exclusively fed for the first few days. At the end of two weeks the hen has usually laid two more eggs in the second nest, so that by the time the squabs in the first nest are ready for market, the second eggs are ready to hatch. It is this double family which necessitates two nests for each pair of birds. Cleanliness is even more imperative in the pigeon-house than in the hen-house. Never neglect to scald out the earthenware nest, and whitewash the compartment it stands in, every time squabs are removed for market, for it is only by such rigid system that the place can be kept in a sanitary condition. Pigeons must have shell, salt and charcoal to be healthy, so there should be a self-feeder with three compartments in each house. When ordering, specify that the oyster-shell is for pigeons, as it is to be broken up smaller than for the hens. The rock salt and charcoal should be ground to about the size of rice. During the heavy breeding season we crush most of the grain, and always peas, for when the parent birds are rushed for time between their two nests they are very liable to pick up whole grain and feed to the young birds before they are able to digest it. Until we discovered this carelessness, we often had a dead squab in the nest. The feed-boxes can be kept filled up, as pigeons never overeat, and must have access to food at all times when they have young ones to feed. If you start with a few pairs of birds, the best way to increase the number is to sell the squabs, and use the money to buy mature birds, for it takes pigeons six months to reach maturity, and it is necessary to have two extra houses in which to keep the growing birds, as they should not be allowed to remain in the regular brood-pen. If, however, you have specially-mated birds and desire to raise their progeny, you must watch the nests, and as soon as the young ones get out on the floor (the old ones generally push them out when the eggs in the second nest hatch), they can fend for themselves, and should be removed to a nursery-house, where all feed must be cracked to the size of rice for several weeks. When one desires to build up size and good points, it is necessary to have two nursery-houses, and so be in a position to select the best birds from different parentage to mate.