Concerning friction(25), Asclepiades looking upon himself as the inventor of it, has said so much in that book, which he entitled ‘of general remedies,’ that tho’ he mentions only three things, that, and wine, and gestation, yet he has taken up the greatest part of his treatise upon the first. Now as it is not fit to defraud the moderns of the merit either of their new discoveries or judicious imitations, _so it is but just_ at the same time to assign those things, which were practised among some of the ancients, to their true authors. It cannot indeed be doubted, that Asclepiades has been both fuller and clearer in his directions, when and how friction ought to be used; but he has discovered nothing, which was not comprized in a few words by the most ancient author Hippocrates; who said, that friction, if violent, hardens the body; if gentle, softens it; if plentiful, extenuates; if moderate, increases its bulk: from whence it follows, that it is to be made use of, when a lax body requires to be braced; or to soften one, that is indurated; or to dissipate where the fulness is hurtful; or to nourish that, which is slender and infirm. Nevertheless, if a person examine more curiously into these different species (which is not here the province of a physician) he will easily understand that the effects of them all proceed from one cause; that is, the carrying off of something. For a part will be bound, when that thing is taken away, the intervention of which had caused it to be lax; and another is softened by removing that, which occasioned the hardness; and the body is filled, not by the friction itself, but by that food, which afterwards makes its way to the skin, relaxed by a kind of digestion(26). And the degree of it is the cause of these effects so widely different.