19. To prepare Vinegar of green woods, an Hundred measures daily, together with Oil of Wood, without Charge; but if any man will have this like other Vinegar, it requires rectifying, which will ask some time and cost: Ten R. Dollers.
20. Although Glauber delivered in a little Tract, a way to make Tartar of the burnt Lees of Wine, yet I have alwaies committed many Errours, by following his very Oral instructions, till bethinking my self, I at last made it with fruit, and plainly reduced it to Crystals.
NB. Whoever will follow the Directions of that Tract, may.
21. To separate every Oar of Copper with profit, and from thence to produce Gain.
22. Of that sort of Copper Oar, if by chance they have any ☽ from thence, to separate it with fruit, without loss of the Copper and Lead.
23. To separate Lead from Tests and Cupels, for small Cost, and as little Labour.
24. To separate Gold and Silver by melting.
25. To build a Furnace, in which one may both torrifie, melt, and try Metals in the Probations of Cineritium; containing the small Trials of an hundred Crucibles, or more, only heat with Wood.
26. Further, a Furnace, in which, without Bellows, one may try a good quantity by the Probations of Cineritium.
And Lastly, Forasmuch as the lesser Trials have deceived me, if I went to work on a greater quantity, I will teach wherein my chief skill consists.