This article is of more recent origin than the former, but has rapidly increased in quantity and value. It can never supersede, but will only stand next in estimation to, the native English long fleece. It is yielded by the half-bred sheep--a race that becomes more numerous every year--being a cross of the Leicester ram with the South-Down, or some other short-woolled ewe; retaining the fattening property and the early maturity of the Leicester, or of both; and the wool deriving length and straightness of fibre from the one, and fineness and feltiness from the other. The average length of staple is about five inches. There is no description of the finer stuff-goods in which this wool is not most extensively and advantageously employed; and the nails, or portions which are broken off by the comb, and left in, whether belonging to this description of wool or to the long wool, are used in the manufacture of several species of cloth of no inferior quality or value. Under the breed of middle wools must be classed those which, when there were but two divisions, were known by the name of short wools; and if English productions were alone treated of, would still retain the same distinctive appellation. To this class belong the South-Down and Cheviot; together with the fleece of several other breeds, not so numerous, nor occupying so great an extent of country. From the change, however, which insensibly took place in them all--the lengthening, and the increased thickness of the fibre, and, more especially, from the gradual introduction of other wools possessing delicacy of fibre, pliability, and felting qualities beyond what these could claim, and at the same time, being cheaper in the market--they lost ground in the manufacture of the finer cloths, and have for some time ceased to be used in the production of them. On the other hand, the changes which have taken place in the construction of machinery have multiplied the purposes to which they may be devoted, and very considerably enhanced their value. These wools, of late, rank among the combing wools; they are prepared as much by the comb as by the card, and in some places more. On this account they meet with a readier sale, at fair, remunerating prices, considering the increased weight of each individual fleece, and the increased weight and earlier maturity of the carcass. The South-Downs yield about seven-tenths of the pure short wools grown in the British kingdoms; but the half-bred sheep has, as has been remarked, encroached on the pure short-woolled one. The average staple of middle-woolled sheep is three and a half inches. These wools are employed in the manufacture of flannels, army and navy cloths, coatings, heavy cloths for calico printers and paper manufacturers, woollen cords, coarse woollens, and blankets; besides being partially used in cassinettes, baizes, bockings, carpets, druggets, etc. SHORT WOOL.