_Preventives_, are general thrift, a range in a good pasture, and a dose of half a pint of wood-ashes every week or fortnight in their food. A small quantity of saltpetre, spirits of turpentine, or tar, will effect the same object. When attacked, apply spirits of turpentine to the loins, and administer calomel carefully; or give half a tablespoonful of copperas daily for one or two weeks. Blind Staggers. This is generally confined to pigs, and manifests itself in foaming at the mouth, rearing on their hind legs, champing and grinding their teeth, and apparent blindness. The proper remedies are bleeding and purging freely, and these frequently fail. Many nostrums have been suggested, but few are of any utility. It is important to keep the issues on the inside of the fore-legs, just below the knee, thoroughly cleansed. The _tails_ of young pigs frequently _drop_ or _rot off_, which is attended with no further disadvantage to the animal than the loss of the member. The _remedies_ are, to give a little brimstone or sulphur in the food of the dam; or rub oil or grease daily on the affected parts. It may be detected by a roughness or scabbiness at the point where separation is likely to occur. _Bleeding._--The most convenient mode, is from an artery just above the knee, on the inside of the fore-arm. It may be drawn more copiously from the roof of the mouth. The flow of blood may usually be stopped, by applying a sponge or cloth with cold water. The diseases of swine, though not numerous, are formidable, and many of them soon become fatal. They have not been the subject of particular scientific study, and most of the remedies applied, are rather the result of casual or hap-hazard suggestion, than of well-digested inference, from long-continued and accurate observation. CHAPTER VIII. FARM-DOGS. No grazing farm is complete without one or more intelligent, well-trained dogs, adapted to the various wants of their owners; and the general taste has made their presence almost universal in every rural household. The dog is peculiarly the friend of man. Many other animals have a temporary though feeble attachment to him, which seems the result rather of constant companionship, or the selfishness of dependence, than any well-settled affection towards a master.