The following brief synopsis of the best methods of cultivation will be sufficient to insure success. The first requisite is suitable water for hatching eggs that have been artificially fecundated, and for the occupancy of fish of different ages, and for different species of fish. Fish of different ages are much inclined to destroy each other for food; and hence, in order to multiply them most rapidly, they should be kept in separate ponds until considerably grown, when they will take care of themselves. A spring sending forth a rivulet of clear water, and not subject to overflow in freshets, is the best location. Clear, cool water is essential to the trout, while some other fish will do well in warm and even roily water. The rivulet running from the spring should be made to form a succession of ponds, three or four in number. These ponds should be connected with flumes made of plank. If the space they must occupy be small, make the flumes zigzag, to increase their length. Put across those flumes, once in four or five feet, a piece of plank half as high as the sides of the flume, with a notch cut in the centre of the top, that the fish may easily pass over: this will afford a succession of little falls, in which the trout very much delights. These different ponds are for the occupancy of fish of different ages, one age only inhabiting one pond. The flumes should have four inches of fine and coarse gravel in the bottom, making the most perfect spawning-ground. Although you would not wish the female-trout to deposite her eggs in the natural way, but will extrude them by the hand (as hereinafter directed), yet they must have these natural conveniences, or they will not incline to spawn at all. At the upper end of each of these flumes separating the ponds, there should be a gate of wire-cloth, to prevent the passage of the fish from one pond to the other; also one at the outlet of the lower pond, to prevent egress of the fish. These must all be so arranged that freshets will not connect them all together. When trout are about to spawn in their natural waters, they select a gravelly margin, and remove, from a circle of about one foot or two feet in diameter, all the sediment, leaving only clean gravel, among which they deposite their eggs, where they are hatched. They want running water of three or four inches in depth for this purpose. A male and female occupy each nest. If left to themselves, they will gradually increase; but so many of their eggs fail of being fecundated, and so many are destroyed before they hatch, by enemies, and by the collection of sediment in the nest, that the number of young fish is small compared with the whole number of eggs deposited. Artificial spawning, fecundation, and hatching, are far more productive. The process is simple and easy: when the female-fish first begins to deposite her eggs, catch her with a small net. It can not be done with bait, for fish will bite nothing at the time of spawning.