places, when the pores of the earth are obstructed, that the humidity, or water cannot penetrate, that then by reason of the correspondency of the Celestiall, and Centrall Sun (for they have a magnetick vertue betwixt themselves) the earth is inflamed by the Sun: so that even sometimes there are made great chops, or furrows in the earth. Cause therefore that there be such an operation in our earth, that the Centrall heat may change the Water into Aire, that it may goe forth into the plaines of the world, and scatter the residue, as I said, through the pores of the earth; and then contrariwise the Aire will be turned into Water, far more subtill then the first Water was: and this is done thus, if thou givest our old man Gold, or Silver to swallow, that he may consume them, and then hee also dying may be burnt, and his ashes scattered into water, and thou boil that water untill it be enough, and thou shalt have a medicine to cure the leprosie. Mark, and be sure that thou takest not cold for hot, or hot for cold, but mixe natures with natures, and if there be any thing that is contrary to nature (for Nature alone is necessary for thee) separate it, that Nature may be like Nature. Doe this by fire, and not with thy hand: and know that if thou dost not follow Nature, all is in vain: and here I have spoken to thee through the help of God, what a father should speak to his son; Hee which hath ears let him heare, and he which hath his senses, let him set his mind upon what I say. [Illustration: *decorative divider*] _THE TWELFTH TREATISE._ _Of the Stone, and its vertue._