Fowls may be confined to a house for a year or more and lay well and be in apparently good condition at the end of such a period, but as the chickens hatched from the eggs of fowls that have been so closely confined for even a few months are almost invariably less vigorous than those produced from fowls that live a more natural life, this plan is not much used except by those who keep a few fowls for their eggs only and renew the stock by purchase as often as necessary. [Illustration: Fig. 70. An old-style small poultry house and yard] To give a flock of a dozen fowls outdoor air and exercise enough to keep them in good condition, a yard containing about 300 sq. ft. is necessary. There is no perceptible advantage in giving more yard room than this, unless the yard can be made so large that grass will grow continuously in the greater part of it. On most soils this would require a yard containing from 750 to 1000 sq. ft. in sod before being used for poultry. [Illustration: Fig. 71. Coop and shade for flock of Bantams[9]] [9] The coop is an old dry-goods box; the shade is a burlap bag. Makeshift arrangements are not always nice looking, but some of the finest chickens are kept in very poor quarters. When fowls are confined to their houses, or to the houses and small yards, the droppings must be removed at frequent, regular intervals. To facilitate this it is customary to have a wide board, called the droppings board, under the roost at a distance of eight or ten inches. All the droppings made while the birds are on the roost fall on this board and are easily collected and removed. It is a good plan to keep a supply of dry earth in a convenient place, and strew a little of this over the droppings board after each cleaning. Sifted coal ashes, land plaster, and dry sawdust are sometimes used instead of earth on the droppings boards. The droppings of fowls, when not mixed with other matter, are often salable for use in tanning leather, but in most cases the difference in their value for this purpose and for use as plant fertilizer is not great enough to pay for the extra trouble which is made by saving them for the tanners. Poultry manure is one of the most valuable fertilizers and can always be used to good advantage on lawns and gardens. [Illustration: Fig. 72. Neat house for six hens]