manner, not labouring to find out the natures and conditions of salts, minerals, and other materials, but contenting themselves onely with the Receipt, saying this or that Author hath written so, and therefore it must be so, whereas many times such books are patcht up out of all sorts of authors. And those that stick to so many books, will hardly ever come to get any good, but are led out of one Labyrinth into another, spending their life miserably in watching and cares: but if they would first seriously consider things, and learn to know nature, and then take their work in hand, then they would sooner attain unto true knowledge; and so much of this matter by the way. I hope that he that hath been in error will be pleased with it, and the knowing will not grudge to have it imparted to the ignorant. That which remains after the distillation is done, is also good for use; if the addition have been of salt of tartar, a melting powder may be made of it, to reduce metals. Of _lapis calaminaris_ or Zinck, yields _per deliquium_ a clear, white, and heavy sharp oyl, for the sharper part of salt armoniack, which did not turn to spirit, hath dissolved _lapis calaminaris_, and is almost of the same vertues for external use in Chyrurgery with that, which above in the first part which was taught to be made out of _lapis calaminaris_, and spirit of salt, save only that this in the distilling doth not yield so strong a spirit as the other, but onely yields a sharp sublimate. _Of the use and vertue of the spirit of salt Armoniack._ This spirit is of a sharp penetrating essence, and of an airy, moist, and warm nature; and therefore may with credit be used in many diseases, 8, 10, 12. (more or less) drops thereof used in a convenient vehicle, do immediately penetrate all the body over, causing sudden sweating, opening the obstructions of the spleen, and dispersing and expelling many malignities by sweat and urine, it cureth the quartane, collick, the suffocation of the Matrix, and many more diseases.