The works of the highly experienced and famous chymist, John Rudolph Glauber

by Johann Rudolf Glauber

N. B. But you are here to observe that the leaden Oars can indeed be commixed with the Salt, and so thrown in upon the Coals: But now Lead admits not of being so dealt withall, for it is not mixable with the Salt, and therefore it requires that the Salt be first cast in upon the Coals, and then must it be thrown in afterwards at top of it. And this way is to be observed and so often repeated and so long, always throwing in, first the Salt then the Lead, till the Lead being turned into ashes, hath wholly lost its metallick Fusion. The said ashes are to be washt with Water and reduced in the Furnace, on such wise as we spake of but now.

N. B. Other lesser Metals may be added to the Lead or to the leaden Vein or Oar, and so be reduced into Ashes together, as Tin, Iron or Copper. But yet these leaden Oars are more advantageous and profitable if they are taken alone, as being more fit for this kind of labour, seeing they have already in them Iron and Copper, and yield not any good and vendible Lead, by reason of their wild nature, and so there’s no need of burning up Copper and Tin which are already vendible.

N. B. Whilest this Incineration is done, many Metallick Flores does ascend up into the Receptacles appointed for the fume to go up in, and which are adjoyned to the Furnace, which (if need be) may be taken out, and by washings be freed from the Salt which ascended together with them, and by Reduction be restored or reduced to their former body: and will yield Lead which contains in it Silver, and is to be converted into Litharge like other Lead, that the Silver may be separated therefrom.

This likewise is heedfully to be observed in the other Minera’s or Oars turned into Ashes, that afore their Reduction, they be thoroughly washt from all the Salt, and the light filths or defilements are to be well separated from the metalline body; for if this be neglected, the Salt being forced with the strong blast of the Bellows would carry off the Metal together with it self, and the Ashes of the Coals would hinder the Fusion of the Metal it self, and reduce the same into Scoria’s.

As concerning the Reduction it self, this is well to be regarded, that the Fire must be kindled in the Furnace at least two hours afore the Ashes of the Oars that are to be reduced, are to be put in, that so the Furnace may be thoroughly bright-hot within; for if it be not through fiery-hot, the Cast in Minera’s melt not, and being not molten they lie in the Fire, and hinder the blast of the Bellows, and spoil the Operation it self.

These labours therefore require a skilfull Artificer, and one versed in such Operations, for they are not so very Facile as they seem to many, to appear to be.

Then farther, this is likewise to be noted, that if the Minera’s or Oars that you take to this Operation are full of Sulphur, and that that Sulphur is not wholly taken away by torrifying [or calcining them] it will by its fierceness reduce in the melting the body of the good Metal into Scoria’s, and instead of Metal present you with Dross. And this is that Incineration and Reduction which I have showed in my Laboratory, both to Friends and Enemies; But yet I have (since that time) found out a far easier way of doing this labour, by the help of which, one Man will do more in one day, than he could otherwise in eight days. But because this way is not as yet made common, it seems not convenient in my Opinion to divulge it here; for as much as I have determined with my self in this present Appendix to disclose onely those things which I exposed to be seen in my Laboratory by others.

By what means Gold, Silver, yea and Copper too, may with great profit be extracted out of the poor Metallick Veins by the moist way, and which cannot quit the costs of doing it by Fire.

First of all, the metallick Earths are to be made red hot, and to be quenched in cold Water, that so being made brittle they may be ground in a Mill. If Sulphur be admixt in them, then must they by a foregoing fireing be freed from the same, because the Sulphur hinders the Aqua Fortis, from duely dissolving those Oars. Being now thus prepared, they are to be put into the stronger Glasses, or into Earthen Cucurbits made of the best Clay, and the following Water is to be poured upon them, and is to cover them over three fingers breadth. The Cucurbit being filled with these matters is to be set in a Case [or Pot] full of Sand, and prepared for this use, and all the Water is to be drawn therefrom by Distillation: which is not onely all of it again recovered, but withall doth get it self an encrease or augmentation from the Salt-peter or the Salt, so that there ascends more Water by Distillation than was poured on.

The Oars are to be taken out of the Cucurbit, (or Cucurbits, if there were more Pots used) and being taken forth you must pour common Water thereupon to extract the remaining Salt thereout of, in the which Salt is found the Gold and the Silver that was in the Oars.