As regards England, I should like to see one of the great rivers of that country turned into a gigantic salmon “manufactory.” Ponds might be readily constructed on one or two places of the Severn, or on some of the other suitable salmon streams of England or Wales, capable of turning out a million fish per annum, and at a comparatively trifling cost. The formation of the ponds would be the chief expense; a couple of men could watch and feed the fry with the greatest ease. The size adopted might be three times that of the ponds on the river Tay, and the original cost of these was less than £500. I would humbly submit that the ponds should be constructed after the manner of the plan I have elsewhere given. Except by the protecting of the spawn and the young fish from their numerous enemies, there is no way of meeting the present great demand for salmon, which, when in season, is in the aggregate of greater value than the best butchers’ meat. The salmon is an excellent fish to work with in a piscicultural sense, because it is large enough to bear a good deal of handling, and it is very accessible to the operations of mankind, because of the instinct which leads it to spawn in the fresh water instead of the sea. It is only such a fish as this monarch of the brook that would individually pay for artificial breeding, for, having a high money value as an animal, it is clear that salmon-culture would in time become as good a way of making money as cattle-feeding or sheep-rearing. There are waste places in England—the Essex marshes, for instance, or the fens of Norfolk—where it would be profitable to cultivate eels or other fish after the manner of the inhabitants of Comacchio. I observed lately some details of a plan to rescue a quantity of land in Essex from the water; it would perhaps pay as well to convert the broad acres in question, from their being near the great London market, into a fish-farm. The English people are fond of eels, and would be able to consume any quantity that might be offered for sale, and the place being in such close proximity to the Thames, other fish might be cultivated as well. All the best portions of the hydraulic apparatus of Comacchio might be imitated, and to suit the locality, such other portions as might be required could be invented. The art of pisciculture is but in its infancy, and we may all live in the hope of seeing great water farms—but, to be profitable, they must be gigantic—for the cultivation of fish, in the same sense as we have extensive grazing or feeding farms for the breeding and rearing of cattle.