For smaller ducks, those kept in the warm brooder house, the fountain plan is to be preferred, as the youngsters can not get into the water and become wet or chilled. These fountains may be made of air-tight cans for the reservoir and a tin plate 2 inches larger in diameter than the can. A tomato can and an ordinary tin pie plate make an excellent fountain. Remove the top of the can and punch a small hole in the side about a quarter of an inch from the free top edge; fill the can with water and place it inverted on the plate. The water will run out until it reaches in the plate the level of the hole in the can. The plate will not overflow and water will be supplied automatically. [Illustration: Fig. 26.--Plan for supplying water by pipes.] Some raisers use a pan--a pie plate, for instance--and place a stone several inches smaller in diameter than the pan in the center, leaving a margin for water around the edge. When large numbers of birds are kept, it is of course necessary that a system for watering be adopted for saving labor. A practical system in use is where the water is supplied by 1-inch pipes and having a cock in each pen directly over the water trough. Fig. 26 shows a diagram drawing of this plan. The flow of the cocks is regulated by having the one in the first pen run very slowly and gradually increasing the flow of the water in each pen. Thus all the troughs will be full at the same time. The pipe should rest on top of the fencing about 2 feet high which divides the runs. This plan of watering can also be used in brooder houses to good advantage. FEEDING.