Then augment your fire from one degree to another, till the Matter become yellower and yellower, to a perfect yellow; then increase it yet stronger, from one degree to another, till it be redder and redder, to a perfect redness; then poure your water upon the red powder with the red Oil, or with the water of Paradise, or with the clear sharp Vinegar, or call it how you will, doing in all points as hath been taught, till the red powder flux like Wax upon a Silver Plate, without fuming, penetrating it as Oil doth dry Leather, that it become good Gold within and without; then render thanks unto God, be obedient to him for his Gifts and Graces. You may again take one half out of the Glass, and make projection, setting the other half in again, as hath been taught, so may you work all your Life-time, for the poor, and perform other duties to Gods Glory, and Salvation of your Soul, as I have said before; enough to the wise. _Projection upon Metal._ Know, my Child, how and in what manner you must use this Stone, which makes projection upon _Mercury_, and all imperfect Metals and Bodies of _Mars_, _Jupiter_ and _Venus_, whereof make Plates glowing hot, whereon straw the Stone, and lay Coals on for a season, that the Stone may penetrate, but the Stones must be made quick with Gold, and _Jupiter_ also, which is very laborious, as is taught in the projection. But you must project upon _Saturn_ or _Luna_, which need not be made quick, only flux them, and cast one part upon a thousand parts, it will be a Medicine, cast one part of these thousand parts upon ten parts, it will be the best Gold that ever was seen on earth. _Its Use in Physick._ This Stone cures all Leprous people, Plague, and all Diseases which may reign upon Earth, or befal Mankind; this is the true _Aurum potabile_, and the true Quintessence which the Ancients sought; this is what thing whereof the whole Troop of Philosophers speak so wondrously, using all possible skill to conceal its Name and Operation, as aforesaid.