_Surfeits_ are occasioned after different manners: for, though many Surfeits proceed from those Parts that are received into the Body; yet, some are occasioned through often repetitions of one and the same actions: As for example, The Eyes may surfeit with too often viewing one Object; the Ears, with often hearing one Sound; the Nose, with smelling one Sent; the Tongue, with one Tast. The same is to be said of the Rational Actions; which Surfeits, occasion an aversion to such or such Particulars: but, for those Surfeits that proceed from the Parts that are received into the Body, they are either through the _quantity_ that oppresses the Nature of the Body; or, through the _quality_ of those Parts, being not agreeable to the Nature of the Body; or, through their Irregularities, that occasion the like Irregularities in the Body: and sometimes, the fault is through the Irregularities of the Body, that hinder those received Parts, or obstruct their Regular Digestions; and sometimes, the fault is both of the Parts of the Body, and those of the Food: but, the Surfeits of those Parts that receive not Food, are caused through the often repetition of one and the same Action. CHAP. XX. Of Natural Evacuations, or Purgings. There are many sorts, and several ways or means of Purging actions; whereof some we name _Natural_, which purge the Excremental Parts; and such Natural Purgings, are only of such Parts as are no ways useful to the Body; or of those that are not willing to convert themselves into the Nature and Property of the Substantial Parts. There must of necessity be Purging actions, as well as Digestive actions; because, no Creature can subsist singly of it self, but all Creatures subsist each by other; so that, there must be Dividing actions, as well as Uniting actions; only, several sorts of Creatures, have several sorts of Nourishments and Evacuations. But this is to be noted, in the Human Nourishments and Evacuations, that, through their Irregularities, some Men may nourish too much, and others purge too much; and some may nourish too little, and some may purge too little. The Irregularities concerning Nourishments, are amongst the adjoining Parts; the Errors concerning Purging, are amongst the Dividing Parts. CHAP. XXI. Of PURGING DRUGGS.