Thus we find that small shot, fired from any gun, is totally inadequate to kill birds protected with down by a body blow; but that large shot, flying from a large gun with not half the velocity of the ineffectual small shot, achieves what is desired. It is the momentum that effects the object. A collateral advantage arising from the use of large shot should not be overlooked. In order to kill in good style with small shot, the aim must be such that the bird fired at shall be near the centre of the charge as thrown; for if the bird be near the outer circle of the charge, it is ten to one that it is only slightly wounded; but if near the outer circle of a charge of large shot, it is ten to one that it is brought down; for it must not be lost sight of, that when large shot is used, a single pellet will mostly be sufficient to bring a bird down. There is a stunning effect produced by large shot, which throws the bird off its balance at once. Small shot has not the same _immediate_ effect. Hares, rabbits, grouse, pheasants, and full-grown partridges, will carry it off, though they fall within a hundred yards. It is very seldom, indeed, that a bird towers after being fired at with large shot. The term friction implies a gradual contraction of the barrel towards the muzzle, which retards the progress of the shot, that more time may be allowed to the powder to burn. Relief accelerates the progress of shot through the barrels. What is the proper degree of relief or friction for different descriptions of barrels, is a subject fruitful of controversy; as is also the form of the breech. The best breech is that which will cause the greatest quantity of powder to consume in the barrel, and give the least recoil. The percussion system of firing has simplified the boring of guns. We think that short barrels intended to be fired by percussion, should be bored perfect cylinders, and the breech should be conical or nearly so, and capable of holding a little more than half a charge of powder. Long barrels should be bored true cylinders throughout the greater part of their length, a little relief being allowed near the muzzle.