As to the first reason, I say a thing can be over-filled in the absence of crude humours, though they be old in the filling (?); and there are people who have narrow veins and
p.47who though they eat little food, digest it well in the stomach and the liver, and none the less do they fatten excessively. Or else we may say: there is so much matter undispersed, because of its (?) labour, that if it be not purged suddenly it would choke them: and nothing evacuates with greater suddenness than a vein; so if it avail not for its own sake, it avails for the excess. In the same way I answer the reasoning he made regarding an imposthume of the breast or lungs. As regards the other argument, that Nature is skilful in her works, I say that is true, when she is greatly troubled therein; and for the other reason, I say the comparison is not right, because there is a big opening in the veins, which the laxative medicaments have not, but they go from the big veins to the narrow veins which are at the back of the liver, and from thence to the still narrower veins called meseraic. Thus it is easy to retain it finally, and therefore at last that thing is expelled which increases most, or which nature needs least.