Every department of the plant should be so located as to economize the time of the attendants. The incubator cellar should be convenient to the brooder house, the brooder house to the growing house and pens, and these to the killing house. The feed house should be located conveniently to the brooder and growing houses and the breeding pens. The task of feeding the growing stock four times a day and the breeding stock twice a day is no small one. Watering is also to be thought about. The exact arrangement of a plant suited to all locations can not be given, as each locality differs from others in some respect, and what may be suitable for one will hardly do for the other. The plans of no two of the largest plants are alike. They differ in location of the buildings to suit the lay of the land; but they all have the same general idea of the convenience of each building to the others. Illustration of this will be seen in fig. 9. When laying out a plant, make provisions for future enlargement; allow plenty of room on all sides to extend the buildings without rendering inconvenient the work that will be necessary to attend to the additional stock. BUILDINGS FOR BREEDING DUCKS. [Illustration: Fig. 10.--House for breeding ducks.] Houses for ducks are single affairs. They are built plain and comfortable, and have no furnishings whatever. A duck is differently constituted from a hen, and must be cared for under different conditions. The hen needs warmer houses and drier surroundings than does the duck. A duck does not mind the cold, if she can keep her feet warm; cold feet will affect a duck as a frozen comb does a hen, retarding laying and inducing ailments. The feathers of a duck are almost impenetrable and will withstand almost any degree of cold. Again, a duck can not stand the amount of confinement in a house that a hen can; she is more restless in disposition and is given to exercise in a greater degree than is a hen. Indigestion is not so prevalent with ducks as with chickens; the duck's ceaseless motion aids the digestive organs and keeps her generally in good health.