Fistulas, too, insidiously attack all parts of the body, owing to unskilfulness on the part of medical men in the use of the knife. The smaller centaury[1] is used for their cure, with the addition of lotions[2] and boiled honey: juice of plantago[3] is also employed, as an injection; cinquefoil, mixed with salt and honey; ladanum,[4] combined with castoreum;[5] cotyledon,[6] applied hot with stag's marrow; pith of the root of verbascum[7] reduced to a liquid state in the shape of a lotion, and injected; root of aristolochia;[8] or juice of tithymalos.[9]