The next part of this shakey house the Wise Man observes, is the _Grinders_; these cease, because they are few. Grinding, all men know to be performed by two hard bodies, the one immovable, on which the Grinding is made, the other movable; which by strong compression against the former, and by its motion, makes the grinding. The upper and the nether millstone, as the scripture calls them, the firm stander, and the strong mover. Now, similar unto these in a mill, there are for that grinding which is performed in the mouth, two jaw-bones, the upper and lower; the upper admits no movement at all, the lower is movable, and so both perform that act called mastication, or chewing. Out of these jaw-bones proceed a certain number of small bones, we call _Teeth_—these are the proper _strict_ instruments of grinding. By the ceasing of the Teeth, we must understand all those infirmities that are incident to them by reason of age, whether looseness, hollowness, rottenness, brokenness, blackness, or whatever else may be an impediment to them in their use; for as age comes on, the natural moisture at the root of the teeth is consumed, and a preternatural is distilled in its room: thus as the teeth drop out, and very few are left in it, the chewing in the mouth ceaseth, more so than when there is none at all, for then the gums might act one against another. But when the grinders are few, they hinder those from working, and having no antagonists they are not able to work themselves, and so the whole grinding ceaseth, which is a great symptom of the decay of life, at least of a state of weakness.