And this way of separation makes much for the poor mineral of copper, which with profit cannot be worked upon by the vulgar way, to be separated from the Copper, afterward by ripening it into a better metal, or turning it into verdy-grease for want of a better art, which business also may well and honestly more than maintain a family. This way also may the rejected dross of the gold, silver, and copper be with profit separated. But because I have decreed to handle here only the extraction of gold out of stones, therefore these menstrues which are used in the extraction of copper and silver, are deservedly omitted, and reserved for another place, where sometime they shall be delivered, to wit, if I shall see that this demonstration shall be accepted in mens eyes, which more very excellent shall follow. As now I have undertaken a more excellent matter in love to my countrey, by which it may appear, that _Germany_ however reduced to want, is yet rich enough, if it would but at last look upon its hidden treasures. There is no need to offer a fore-chewed bit, for demonstration is sufficient, neither will we obtrude a good upon the negligent; for to the ungrateful the best things are unacceptable. These therefore being waved, in short we will give the demonstration and extraction of those flints, not doubting but the expert and experienced, though the sluggish may not, will thence reap profit, and give God the praise. What belongs then to the aforesaid stones, out of which gold may be extracted, thus the matter stands. All kind of flints for the most part have invisible gold, sometimes visible and invisible, volatile and corporeal together: but many commonly contain impure iron-like volatile gold, and also mature, and a few, sulphureous and copper-like.