When it is desired to mate a particular male and female, the best way is to place them one in each side of a small coop with a wire partition across the middle. This coop should be put where they cannot see other pigeons. Sometimes one of the birds shows a decided antipathy to the other. In such a case it is, as a rule, useless to continue efforts to induce them to pair. In most cases, however, the birds will soon show mutual affection. When this stage is reached, they may be taken to the loft and released. Short coarse straw or fine twigs should be placed where pigeons that are building nests can take what they want. No nest box or pan is really needed, but many pigeon keepers use a nest bowl, called a nappy, of earthenware or wood fiber. =Feeding.= The food of pigeons consists almost wholly of grains and seeds. The principal grains used in America are wheat and corn (usually cracked corn). Field peas are also used quite extensively. While pigeons will eat the same kinds of ground-grain products as are fed to poultry, pigeon keepers rarely use such foods. They prefer to give a variety of hard grains and seeds. Those who keep large stocks of pigeons often buy separately the feeds which they use, and mix the grains to suit themselves, or feed them in such alternation as seems desirable. People who keep only a few pairs of pigeons usually find it more satisfactory to buy the feed mixtures sold by dealers in pigeons' supplies. As a rule, old grain and seed that are very dry and hard are best for pigeons, and especially for exhibition and breeding stock. [Illustration: Fig. 216. An attractive squab plant] The most common practice is to give the feed in hoppers, keeping a supply always before the birds. This is done principally because it is the most convenient way, particularly for those who are away from home a great deal. For them hopper feeding is really necessary, but pigeon fanciers seem to agree that when the birds can be fed by throwing on the floor of the loft or the fly, two or three times a day, just about the quantity of food that they need for a meal, they do better and the cost of food is less than by the hopper method. Unlike poultry, pigeons require considerable quantities of salt. The common practice is to keep it before them in the form of lumps of rock salt, one large lump being enough for the birds in a loft of ordinary size. Oyster shell should also be supplied. [Illustration: Fig. 217. Homer squabs four weeks old] [Illustration: Fig. 218. Carneaux squabs four weeks old]