In the second division, the fermenting poultice[67] is often of service; but it must, like all other applications, be continued no longer than the state which it was intended to remove remains. If we continue it too long, we do hurt; for, if it be kept on when it produces continued pain, it induces a state of overaction, similar to that which it was intended to destroy. Whenever the surface becomes redder, and the pain less, it may be useful to employ some other application, such as laudanum, &c. [67] The fermenting poultice is made by adding a spoonful of yest to an oatmeal poultice, and placing it before the fire until it begins to emit air, or rise up in a bubbling way. It is then fit for applying to the sore. The same observations apply to the use of the gastric juice. Cloths dipped in this sometimes make the overacting surface slough off, and leave the parts below more healthy. The same may be said of the expressed juice of sorrel. Lime water sometimes operates in the same way. Red precipitate, mixed with its weight of powdered opium, and half its weight of camphor, may be usefully sprinkled over the surface. A pound of the recent leaves of hemlock, boiled for half an hour in two pounds of milk, and then expressed, forms an application which sometimes abates the pain, and renders the action more healthy. The juice is to be made into a poultice with crumb of bread. Decoction of the walnut tree leaves, applied by means of pledgets of linen, or made into a poultice with bran, is occasionally of service. When, by any of these applications, the morbid state of the ulcer is removed, it is to be dressed according to the genus into which it is then converted. After these remarks, the treatment of this genus of ulcers may be comprised in the following observations: First, In the first variety of the first species, or the simple fungous ulcer, the cure is to be attempted by pressure, and gentle stimulants, which render the action more natural, and the granulations, in consequence, more perfect and compact. Second, In the second variety of this species, we are to employ the same remedies, as palliatives, or as means which may promote the exfoliation of the bone. But, if the disease in the bone be more extensive and tedious, we must cut down through the ulcer, and apply caustic, or mechanical cures, such as perforation, to the caries.