At least one-fourth of each of the ponds should not be over one foot in depth, and this portion should be planted with pond weed (_Potamogeton_) and water weed (_Elodea_, or _Anacharis_) to facilitate the production and growth of the minute animals which furnish so large a part of the food for the Frogs at all stages of growth. The rest of the pond should have a gradually sloping bottom, and consequent increase depth to the outlet (or drawoff), where the water should be at least five feet deep, so that in drawing off the ponds the stock can be assembled in a small area for sorting, etc. The bottom of the ponds, preferable, soft muck, in which the Frogs can bury themselves in cold weather and avoid against danger of freezing. In the middle of all the ponds, except the spawn hatching pond, water lilies should be planted, the large pods, such as (_Nymphea alba_). These plants furnish hiding places from fish hawks, also serve as a sun shade and stool for sunning during summer. It is not advisable to place large bowlders in the pond, as they are in the way of seining or netting, and furnish an acceptable resort for crawfish, which are enemies when large. Nursery ponds should be constructed to afford young protection from enemies and to produce the greatest quantity of insect life suited for their sustenance, and this is better accomplished with a number of small ponds than with one large one. A good working size for spawn breeding is from 40 to 50 feet long, by 12 to 15 feet wide, with a depth of from 18 to 36 inches deep to the outlet. Where the topography of the ground will permit it is better to have the nurseries immediately adjoining the spawning pond. With water supply from same source, so that there will be but slight difference between the temperature of the shallowest part of nursery pond and surface of water of spawning pond. If the location is infested with crawfish or snakes the nurseries should be protected by wire screens. The spawning nursery ponds may be combined by constructing one comparatively long pond, narrow near the middle, so that the general shape would be like an hour-glass. Across the narrow part is to be stretched a screen of one-quarter inch wire cloth, which will confine the spawners to the deeper end of the pond, while the fry or hatching spawn will be kept separate. This form of pond is advantageous where for any reason only a few ponds can be built. Between all ponds that are connected they should be screened where water runs from one pond to the other, that is, at the inlet and outlets. Each pond should be surrounded by one-half inch wire mesh two feet high. This makes a protection to the ponds from enemies, and also keeps the Frogs confined to the ponds they are intended. Care of Ponds.