Take of white tartar made into powder about ten or thirty ℔. pour so much water upon it, as is needful for to dissolve it, and boyl it by a strong fire in a tinned kettle, until all the tartar be dissolved, which you may know by stirring in it with a wooden ladle, and skim off diligently all the filth rising on the water; and you must take heed, that you take neither too much nor too little water to it; for if you take too little, part of the tartar will remain undissolved, and so will be cast away and lost among the slime: but if you take too much of it, then the tartar is too much disspersed in the water, and cannot shoot well, and so will likewise be lost, being cast away afterwards with the water. For I have heard many a one complain, that they could get but little of a pound, and therefore supposed the tartar to have been naught, whereas the fault was not in the tartar, but in the workman, that managed not well his work, pouring away one half which did not shoot with the water: but if you proceed well, then four pound of common tartar will yield ℔ iij. of pure white crystals. The solution being well made, and no skim more rising at the top, cover the kettle, and let it cool without removing from the warm place it stands in, which will be done within three or four dayes, if the kettle be bigg. But the fire must be taken away from under the kettle, and so let it stand for the time mentioned. In the mean while the Tartar will crystallise to the sides of the kettle, which crystals after the time is expired, and the water poured off, are to be taken out and washed and boyled again with fresh water, and so skimmed and crystallised; and this proceeding must be still reiterated, untill (which is done the third or fourth time) the crystals are white enough: then take them out, dry and keep them for use; whereof from ʒ j. to ℥ j. made into powder, and taken in wine, beer, warm broth or other liquor, will give some gentle stooles, and serveth for those, which cannot endure strong physick. This tartar may be sharpned with Diagridium or any other purging drug, that so you need not take it in so great a quantity at once, but a lesser dose may serve turn. But if you do not look for great crystals, but only for Tartar well purified, then you may use this following manual, and you will get exceeding fair and glistering little crystals, which need no beating into powder, but by the working come to be so pure and fine, as if they had been ground upon a stone, and looking not like a dead powder, but having a gloss, like unto small glistering snow that fell in very cold weather, and it is done thus: when the crystals are come to be pure enough by often dissolving and coagulating, then dissolve them once again in pure water, and pour the solution into a clean vessel of wood, copper, or earth being glased; and let it not stand still (as above taught with the crystals) but as soon as it is powred in, with a clean wooden stick