As the amusement of fly-fishing is one which holds a first place in the opinion of every one who understands it; and as the trout and the salmon are the only fish which afford genuine sport to the angler; and as I believe that the latter, in the southern counties of England, is nearly ex-tinct, whilst the former is there far from being abundant; I wish to call the attention of such of your readers as are possessed by the true piscatorial furor, to the facility with which these fish can be bred artificially; and as many experiments have been made by my directions, and I have witnessed the results, I beg to say that there is no fear of success, if due care is taken. The experiments of Sharr, Agassiz, etc, have proved that fish can be bred artificially (the experiments of Boccius I have not yet tried, although he professes to arrive at the same results in another manner) ; and acting on the plan recommended by them, I have known both trout and salmon bred by thousands for the last 10 years; and as now is the time for the experiments to be made, I hope that those who intend to try the plan will lose no time in looking after their supply of breeding fish.

To begin with trout: catch as many as you can conveniently obtain upon the spawingbeds* and examine them carefully one by one, to see that the spawn and milt are in a tit state for exclusion, and also to enable you to separate the males from the females. If they are in a fit state to be operated upon, which may be known by the facility with which the milt and the roe run from them, on a slight pressure, squeeze the milt of the males into a little water. When you have obtained all the milt you can get, add so much water that the mixture remains slightly opalescent; say about equal in color to a table-spoonful of milk mixed in a quart of water. Pour this Snto a deep dish or bowl, large enough to hold the largest of your female trouts. Take one of these, put it into the water so prepared, and gently squeeze the roe from it, whilst overhead in the water.† Do this as quickly as possible and return the fish into fresh water, and then pour off the water containing the impregnated roc. through a strainer, carefully preserving it for the remaining fish, and immediately return the roe into fresh spring or brook water. Repeat the operation for every female trout, and you will then have a quantity of impregnated roe, which, if properly managed, will hatch with great certainty.

Have ready as many boxes as vou are able to stock with spawn, made 3 feet long, 2 feet broad, and 6 inches deep; fill them two inches deep with river sand, so well washed that there is not a particle of mud left in it, and upon that put two inches of gravel, also exceedingly well washed, and varying in size from a hazel nut to a pigeon's or pullet's egg. There boxes must be so placed that the water from a spring will run into the first, and from the surface of that into the second. See.; and below the whole nest of boxes, there ought to be a small reservoir made, say three yards by two ditto, and 18 inches deep, and well gravelled at the bottom ; all these things having been previously arranged, and the water flowing nicely over the gravel, sprinkle the impregnated roe equally over the surface of the gravel, say a quarter of a pint to each box. and it will roll down the interstices of the gravel, and find a bed in which it will remain snugly until the spring, then, about March, if all has been properly managed, you will find, on a careful examination, that the young trouts are coming to life by hundreds.

I am very particular in recommending a spring, rather than a brook, for several reasons; in the first place, brooks a re liable to be flooded, and are sometimes so overcharged with sand, mud. etc, that the gravel in the spawning boxes is completely choked with it, and the spawn is lost, as I know to my great and frequent disappointment; at other times all is washed away together. In the second place, the gravel of brooks swarms with water-lice, and the larva? of aquatic Mies, as well as bullheads and loaches, all of which prey upon the spawn of both the trout and the salmon; and in the third place, if you place your spawning-boxes in a brook, it is difficult to prevent the escape of the fry when hatched, and you are left in doubt as to the success of your experiment; with a spring all these inconveniences are obviated, but if your water-course should contain water-lice or aquatic larvae, it is a very easy matter to destroy them before putting in your boxes, with a little quicklime. It is also desirable to cover your spawning boxes with a wire grating, and also to protect them in severe weather from the chance of being frozen.

When they login to hatch ,opon a communication between the boxes and the little ! reservoir below, and if this communicates with a water course.in which aquatic plants are grow, ing, so much the better; the fry as soon as they are strong enough, will make their way into this ditch, and will find an abundance of food among the water plants; from theivce they ought to be able to make their way into the brook, river ; or lake, which it to intended to store with them; i but all ducks, wild and tame, should be driven from this ditch, or there will be few trouts allowed to find their final place of destination. 1 The above rules, with some modifications, are applicable to the breeding of salmon as well as trout, the only difference being in the made of placing the female fish. The salmon is too large a fish to put into the vessel in which the diluted milt is placed; but I think it desirable that she should be held by an assistant in such a manner that the tail and lower part of the body, up to the vent, are immersed in the water containing the milt; it is also very necessary to hold her firmly, otherwise a large fish, in the struggles it makes to get free, is apt to upset the vessel containing the milt, and then the experiment is at an end; at least for a time; being held firmly by the assistant as above, the belly of the fish must be gently pressed by the hands, to promote the emission of the spawn, which on emission must be gently stirred in the water, to bring every grain of it into contact with the milt; but do not allow it to remain longer in that liquor than a minute, as I have found that if the diluted milt is too strong, or if the ova remain too long in contact with it, they become opaque and never hatch at all, apparently he-cause they are over impregnated.

In the ordinary way in which salmon and trout are bred, the milt must be largely diluted with water, and the contact between the milt and the ova can only be momentary; for the streams in which these fish spawn (particularly salmon) are so rapid that the milt on exclusion must be carried away immediately.

* I have frequently found, when catching trout for this purpose. that the milt and roe were not ready lor emission. When this was the case, I enclosed the fish in a wire cnire, which I immersed in water, exam ning them every week, until I found they were ready for the experiment.

† I fancy that if the ova come in contiict with the nil on emision. that they are not so readily impregnated us if they are kept covered with the water until the impregnation has taken place, and therefore I wish to lny some stress on the desirableness of thus keeping the air exclud-ed. The milt remains in an active state long after emis-sion, but I have great rennon to suppose that this is by no means the case with the roe.

I am quite aware that there is another theory which assumes that impregnation takes place. 12 months before emission; but a very careful examination of the spawnings of minnows and i lampreys (I have never been able closely to examine the spawning of the salmon,) convinces me that it is not a correct one; besides, did any one ever succeed in hatching the ova offish which had not been allowed to come into contact with milt after exclusion; if they have, when - where - and how was it accomplished, and where is it recorded?* I know that I could never succeed, although I have often tried the experiment; on the other hand, it is the easiest thing imaginable, with due care and a suitable situation, to hatch those that have been properly impregnated after emission. But if J admit, to avoid argument, that this theory is correct, it will not interfere at all with the artificial breeding of trout and salmon; on the contrary it would materially facilitate it. It would only be necessary to catch a female fish, with the ova ready for emission, and place these ova in clean gravel, in a box, as before described; but there would be no occasion for males.

T. G. Gard. Chron.