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they die of the rot, all these appearances are ranch aggra-vated, the liver in particular being a horrible mass of corrup-tion.
The means of prevention arc, draining, shelter, regularmaintenance at all seasons, for which purpose hay should beprovided if possible ; and the pasture should be rather under-stocked. Purgatives have been recommended in the firststages of the disease, and afterwards mercury applied exter-nally to the bare skin on the region of the liver.
Besides these, and probably several other local diseaseslittle known, sheep are liable to external accidents, some ofwhich are almost peculiar to them, and occasionally produc-tive of much loss; and they are often greatly distressed byvermin.
The Iced or sheep-louse attacks sheep of all descriptions,but chiefly hogs that are in an unthriving state. Theybreed mostly about the throat, and occasion the sheep to bendits neck so much, to be relieved from their attacks, that theteeth often fasten in the wool, so that it cannot disengagethem, and if not soon relieved, the animal perishes. Theyseldom or never prove fatal of themselves, for all the varioussalves that are used for sheep destroy keds; but if any whiteor unsmeared spot is carelessly left, they soon find it out andnestle upon it. Ewes and wedders, though not smeared, ifin good condition, seldom suffer much from keds.
Ticks, when full grown, are six times larger than keds, butnot so general over the country. This insect, like the ked,is of a flat form; of a brown or livid colour with some lightspecks on its back. It has six legs, and a flat proboscis,with three notches, like the teeth of a saw, on each side;with this it insinuates its head beneath the skin of the sheep,where it continues to suck blood, and swells for weeks andeven months together. They only fasten on such parts ofthe animal as have little or no wool upon them. They are•asily destroyed by tar or turpentine; but on ground where