the same family for a great many years; but it was attended with considerable deterioration in the quality of the wool, and engendered a liability to disease, sufficient to deter any one from proceeding a similar length in the same track, to what is so dubiously called improvement. See what Mr Dickson says to this effect, in a recent number of the _Quarterly Journal of Agriculture_. "The evil of breeding _in-and-in_, or in other words, producing too great refinement of tone, is manifested in the first instance by a tenderness of constitution; the animals not being able to withstand the extremes of heat and cold, rain and drought. If the evil is prolonged through several generations, the forms of the animals become affected, the bone becomes very small, the neck droops, the skin of the head becomes tight and scantily covered with hair, the expression of the eye indicates extreme sensibility, the hair on the body becomes thin and short, and the skin as thin as paper; the _points_ continue good, and predisposition to fatness increases, but the whole carcass becomes much diminished in size, though retaining its plumpness, and beautiful symmetry. The evil, however, does not terminate in the production of these symptoms. Internal diseases ensue, such as disorganization of the liver, or rot, polypi in the trachea, clyers, malformation of the bones of the neck and legs, and general deformity." This position, however, will be strengthened by drawing attention to insulated portions of our race, where the effects of such a system are exhibited on a considerable scale. The Members of the Society of Friends were, at one time, supposed to be of all others the least subject to insanity; but the very reverse is the case; being, from the limited nature of their sect, driven to frequent intermarriages, and to a consequent deterioration of the most active part of the human frame--the brain. It is for the same reason, that almost every royal family contains a large proportion of idiots, or, at the best, persons of very weak intellect; and, such will continue to occur, till legislators fall on some plan of striking at the groundwork of the mischief. If the laws of God and man define to us so clearly the evils of intermarrying with relatives; and if, as all animals are constructed on one grand plan, we admit the proximity of the sheep to the human race, it follows, that what is destructive, in this respect, to the one, is destructive to the other; and that we should seek, by a nearly similar, if not wider, range of rules, to obviate many of those diseases of which, when under our protection, they are so frequently the subjects.