When the purging has ceased, or _the physic is set_, a mash should be given once or twice every day until the next dose is taken, between which and the _setting_ of the first, there should be an interval of a week. The horse should recover from the languor and debility occasioned by the first dose, before he is harassed by a second. Eight or ten tolerably copious motions, will be perfectly sufficient to answer every good purpose, although the groom may not be satisfied unless double the quantity are procured. The consequence of too strong purgation will be, that weakness will hang about the animal for several days or weeks, and inflammation will often ensue from the over-irritation of the intestinal canal. Long-continued custom has made ALOES the almost invariable purgative of the horse, and very properly so; for there is no other at once so sure and so safe. The Barbadoes aloes, although sometimes very dear, should alone be used. The dose, with a horse properly prepared, will vary from four to seven drachms. Custom has assigned the form of a ball to physic, but good sense will in due time introduce the solution of aloes, as acting more speedily, effectually, and safely. The only other purgative on which dependence can be placed is the CROTON. The farina or meal of the nut is generally used; but from its acrimony it should be given in the form of ball, with linseed meal. The dose varies from a scruple to half a drachm. It acts more speedily than the aloes, and without the nausea which they produce; but it causes more watery stools, and, consequently, more debility. LINSEED OIL is an uncertain but safe purgative, in doses from a pound to a pound and a half. OLIVE OIL is more uncertain, but safe; but CASTOR OIL, that mild aperient in the human being, is both uncertain and unsafe. EPSOM SALTS are inefficacious, except in the immense dose of a pound and a half, and then they are not always safe. Worms. The long white worm (_lumbricus teres_) much resembles the common earth-worm, and being from six to ten inches in length, inhabits the small intestines. It is a formidable looking animal; and if there are many of them, they may consume more than can be spared of the nutritive part of the food, or the mucus of the bowels. A tight skin, and rough coat, and tucked-up belly, are sometimes connected with their presence. They are then, however, voided in large quantities. _Remedies._--A dose of physic will sometimes bring away almost incredible quantities of them. Calomel is frequently given as a vermifuge. The seldomer this drug is administered to the horse, the better. When the horse can be spared, a strong dose of physic is an excellent vermifuge, so far as the long round worm is concerned. But a better medicine, and not interfering with either the feeding or work of the horse, is emetic tartar, with ginger, made into a ball with linseed meal and treacle, and given every morning, half an hour before the horse is fed.