But those men do not know the hurtful nature of it, which it doth shew against the sinews and Nerves: For some are of opinion, that if they know to prepare Mercury so, that it can be given in a greater dose (as is to be seen in sublimed _Mercurius dulcis_) that then it is excellently prepared: but they are in a great errour, and it were much better, it were not so well prepared, that the less hurt might be done to Man, in regard that then they durst not give it in so great a dose. For if that which is prepared with _Aqua fortis_ or spirit of salt nitre be used in the pox to men that are advanced in years, it cannot do so much hurt, because it is given in a small dose, and doth work with them, whereby nature gets help for to overcome and expel that hurtful venome, and its malignity is abated by the strong salivation, which provident nature hath planted in it, so that not so much mischief can come by it, as by _Mercurius dulcis_, whereof is given to little weak Children from ten to thirty grains at once, which commonly (unless they be of a strong nature, and do grow it out) doth cause a weakness and lameness in their limbs, so that (if they do not come to be quite lame at last) they have a long time to struggle withal, till they overcome it. In like manner those also do err, which do shake Mercury in water or beer so long, until the water come to be gray-coloured, and so give that water or beer to little children to drink for the Worms, pretending that they do not give the substance or body of Mercury, but only its vertue. But this gross Preparation is no better than if they had ministred the running Mercury it self. Neither have I ever seen that the use of _Mercurius dulcis_, or of the gray coloured water was seconded with good success in killing of the Worms. But it is credible, that it may be done by yellow or red precipitate, in regard of its strong operation. But who would be such an Enemy to his Child, as to plague and torture it with such a hurtful and murthering medicine; especially there being other medicines to be had, which do no harm to the children, as is to be found in iron or steel, and the sweet oyl of vitriol.