The prairies seem adapted to the usual varieties of sheep introduced into the United States; and of such are the flocks made up, according to the taste or judgment of the owners. Shepherd-dogs are invaluable to the owners of flocks, in those unfenced, illimitable ranges, both as a defence against the small prairie-wolf, which prowls around the sheep, but which are rapidly thinning off by the settlers; and also as assistants to the shepherds in driving and herding their flocks on the open ground. DISEASES OF SHEEP. The dry and healthful climate, the rolling surface, and the sweet and varied herbage, which generally prevail in the United States, insure perfect health to an originally sound and well-selected flock, unless peculiarly exposed to disease. No country is better suited to sheep, than most of the northern and some of the southern parts of our own. In Europe, and especially in England, where the system of management is necessarily in the highest degree artificial, consisting frequently in early and continued forcing the system, folding on wet, plowed grounds, and the excessive use of that watery food, the Swedes turnip, there are numerous and fatal diseases. Hence the long list which lumbers the pages of foreign writers on sheep. The most destructive of these are the rot, and epidemics which are scarcely known in America, except by report. The diseases incident to our flocks may generally be considered as casualties, rather than as inbred, or necessarily arising from the quality of food, or from local causes. It may be safely asserted, that with a dry pasture, well stocked with varied and nutritious grasses; a clear, running stream; sufficient shade and protection against severe storms; a constant supply of salt, tar, and sulphur in summer; good hay, and sometimes roots, with ample shelters in winter; young sheep, originally sound and healthy, will seldom or never get diseased on American soil. The few diseases which it may be necessary here to mention, will be treated in the simplest manner. Remedies of general application, to be administered often by the unskilful and ignorant, must neither be elaborate nor complicated; and, if expensive, the lives of most sheep would be dearly purchased by their application. A sheep which the owner has reared or purchased at the ordinary price, is the only domestic animal which can die without material loss to its owner. The wool and pelt will, in most instances, repay its cost, while the carcasses of other animals will be worthless except for manure. The loss of sheep from occasional disease, will leave the farmer's pocket in a very different condition from the loss of an equal value in horses or cattle. Yet humanity, equally with interest, dictates the use of such simple remedies for the removal of suffering and disease, as may be within reach. Diarrh[oe]a or Scours,