country gentleman, who in this way might make not only curious but useful discoveries. POIET.—So much science would be required to make these experiments with success, and there would be so many difficulties in the way of preserving fishes at the time they are proper for reproduction, that I fear very few country gentlemen would be capable of prosecuting the inquiry. HAL.—The science required for this object is easily attained, and the difficulties are quite imaginary. The impregnation of the ova of fishes is performed out of the body, and it is only necessary to pour the seminal liquor from the melt upon the ova in water. Mr. Jacobi, a German gentleman, who made many years ago experiments on the increase of trout and salmon, informs us, that the ova and melt of mature fish, recently dead, will produce living offspring. His plan of raising trout from the egg was a very simple one. He had a box made with a small wire grating at one end in the cover, for admitting water from a fresh source or stream, and at the other end of the side of the box there were a number of holes to permit the exit of the water: the bottom of the box was filled with pebbles and gravel of different sizes, which were kept covered with water that was always in motion. In November or the beginning of December, when the trout were in full maturity for spawning, and collected in the rivers for this purpose upon beds of gravel, he caught males and females in a net, and by the pressure of his hands, received the ova in a basin of water, and suffered the melt or seminal fluid to pass into the basin; and after they had remained a few minutes together, he introduced them upon the gravel in the box, which was placed under a source of fresh, cool, and pure water. In a few weeks the eggs burst, and the box was filled with an immense number of young trout, which had a small bag attached to the lower part of their body containing a part of the yolk of the egg, which was still their nourishment. In this state they were easily carried from place to place in confined portions of fresh water for some days, requiring apparently no food; but, after about a week, the nourishment in their bag being exhausted, they began to seek their food in the water, and rapidly increased in size. As I have said before, Mr. Jacobi assures us, that the experiment succeeded as well with mature fish, that had been killed for the purpose of procuring the roe and melt, these having been mixed together in cold water immediately after they were taken out of the body. I have had this experiment tried twice, and with perfect success, and it offers a very good mode of increasing to any extent the quantity of trout in rivers or lakes, for the young ones are preserved from the attacks of fishes, and other voracious animals or insects, at the time when they are most easily destroyed, and perfectly helpless. The same plan, I have no doubt, would answer equally well with grayling or other varieties of the salmo genus.