There have been several importations of the Herefords into the United States, which by crossing with our native cattle, have done great good; but with the exception of a few fine animals at the South, we are not aware of their being kept in a state of purity, till the importation of the splendid herd. within the last six years, by Messrs. Corning and Sotham of Albany, N. Y. These Herefords are among the very best which England can produce, and come up fully to the description of the choicest of the breed. Mr. Sotham, after an experience of several years, is satisfied with the cows for the dairy; and he has given very favorable published statements of the results of their milking qualities, from which it may be properly inferred, that Youatt drew his estimates from some herds which were quite indifferent in this property. They are peculiarly the grazier's animal, as they improve rapidly and mature early on medium feed. They are excelled for the yoke, if at all, only by the Devons, which, in some features, they strongly resemble. Both are probably divergent branches of the same original stock. The Ayrshire Is a breed that has been much sought after of late years, from their reputation for fine dairy qualities. The milk is good both in quantity and quality, yielding, according to a recent statement of Mr. Tennant, of Scotland, who owns a large herd, fifteen quarts per day during the best of the season, twelve of which made a pound of butter. The product of the latter averages about 170 pounds per annum to each cow. Another authority says, on the best low-land pasture, a good cow yields nearly 4000 quarts per year. This is a large quantity, and implies good cows and extra feed. Mr. Cushing, of Massachusetts, who imported several select animals, without regard to their cost, informed us, after three or four years' trial, that he did not perceive any superiority in them, over the good native cows of that state, for dairy purposes. A large number have been imported in detached parcels, and scattered through the country. They are good animals, but seem to combine no valuable properties in a higher degree than are to be found in our own good cattle, and especially such as are produced from a cross of the Short Horn bull of a good milking family, on our native cows. They are evidently a recent breed, and do not therefore possess that uniformity of appearance and quality, which attaches to one of long cultivation.