180--186. UponSilver (3.) The Salt or Sugar of Lead, by cryftallizing the Vinegar of Lead. (4.) The Salt of Lead with a dilute Spirit of Nitre, inftead of Vinegar. (5.) An alchemiftical Treatment of the Salt of Lead with Alkalies, in order to procure the Mercury of the Metal; which the Author here feems, in the alchemistical Manner, to intimate poffible. (6.) The Reduction of the Sugar or Vitriol of Lead to a Calx, by keeping it ftirred over the Fire. (7.) The BaHam of Lead, by diffolving the Metal in boiling Oil. (8.) The Balfam of Lead with æthereal Oil of Turpentine, by boiling the Menftruum upon Sugar of Lead. And, (9.) The Glafs of Lead by melting Red Lead with Sand. PROCESS 180186. are performed upon Silver; and fhew, (1.) The common Way of diffolving pure Silver in Aqua fortis, or Spirit of Nitre. (2.) This Solution reduc'd to the Vitriol of Silver, by Cryftallization, or cool ftanding. (3.) The Lunar Cauftic, or Lapis Infernalis, by melting the Cryftals of Silver, and pouring the Matter into Moulds. (4.) The Silver Pill, or celebrated Purge in the Dropfy; by mixing a Solution of Nitre with a Solution of the Cryftals of Silver, and exhaling the fuperfluous Moisture. (5) Inflammable Silver, or Silver made to flame, by putting a little of the Lunar Cauftic into a fcooped glowing Coal; whereby the Silver is at the fame time recover'd. (6.) Silver recover'd when diffolved in Spirit of Nitre, by Precipitation with Copper-plates. (7.) The Lunea Cornea, or Manner of bringing Silver into a horny Subftance, by precipitating a Solution of the Metal with Sea-falt, and melting the Precipitate. PRO PROCESS 187. fhews that Tin will diffolve in 187. Aqua Regia. Upon Tin. PROCESS 188-192 are performed upon 188--192. Copper; and fhew, (1.) That this Metal will Upon Cop diffolve in distilled Vinegar. (2.) In a Solution per. of Sal-ammoniac. (3.) In Aqua fortis. (4.) In Aqua regia. And, (5.) In volatile Alkalies. PROCESS 193-204. are either performed 193--204. upon, or by means of Mercury, or Quickfil- Upon Quick file ver; and fhew, (1.) The Way of purifying ver. Quickfilver, or difcovering when it is foul and adulterated; and this by means of Diftillation. (2.) That it diffolves in Aqua fortis. (3.) That this Solution, when rich, fhoots into a Vitriol by standing. (4.) That this Solution precipitated with Sea-falt, makes the white Precipitate of Mercury.. (5.) That the fame Solution evaporated, and urged with a strong Heat, makes the red Precipitate of Mercury. (6.) That the Vitriol of Quickfilver, dry'd, and fublimed with decrepitated Salt and Vitriol, makes Mercury-Sublimate. (7.) That Quickfilver diffolv'd in Oil of Vitriol, brought to Calx, and washed, makes the Turbith Mineral. (8.) That, the fame Calx turns to a fiery Oil of Mercury, by having Oil of Vitriol, feveral times drawn over from it. (9.) That Quickfilver being intimately mixed with Brimftone, makes Æthiops Mineral.ro.) That this Æthiops Mineral being fublimed, makes factitious Cinnabar. (11.) That all the Metals except Iron, amalgamate with Quickfilver. And here, among the reft, the Author delivers a ready Way of making the Amalgam of Copper, by grinding the Metal (first diffolved in Aqua fortis, then precipitated, wash'd, and dried) along with Mercury; which we with may fucceed fo eafily as he declares it C2 will. 105. will. (12.) We have another alchemiftical Procefs, on the Manner of wafhing Metals, by grinding them with Mercury and Water. But the Author referves what he can fay upon this Process to another Oportunity. PROCESS 205. fhews the Manner of diffolUpon Gold.ving Gold in Aqua regia; and with this conclude the Proceffes upon Metals. Proceffes We are now come to the laft Stage of these upon Semi-Proceffes; viz. to thofe upon Semimetals, which the Author divides into faline and fulphureous. Under the faline kind he only infifts upon Vitriol, and under the fulphureous, on-Antimony. 206. Vitriol. 207. PROCESS 206. therefore fhews the Manner of analyfing Vitriol, or refolving it into Spirit, Oil, and Colcothar; that is, the common Method of making the ftrong Acid, abusively calded Oil of Vitriol; which is performed by calcining the Subject, and afterwards urging it with a violent Heat, in certain earthen Veffels, or Long-Necks, made for the purpose; fo as to drive over the Liquor into Glafs Receivers. PROCESS 207. fhews the Manner of making EnsVeneris. what is called Ens Veneris, from the Colcothar remaining in the preceding Operation; by fub.. liming the washed Calx, with Sal-ammo mony. niac... PROCESS 208-227. are all performed upon 208-227. Proceffes Antimony; which is here produc'd as an eminent upon Anti- Example of the fulphureous Tribe of Semimetals. These Proceffes fhew, (1.) The Way of diffolving Antimony in Aqua regia. (2.) How a real Brimftone may be obtained from it, by means of the preceding Solution, and Washing. (3.) That Antimony turns to a Glafs, by being firft calcined, and afterwards melted. (4) The common Way of making the Regulus of Anti mony, mony, by melting it with the fluxing Salts; tion. THE whole is clofed with the Recapitulation, The Au mention'd above; for which as there was nothor's Regreat neceffity, fo it contains very little to the capitulapurpofe; being only a jejune and dry Indication of Particulars, occurring under the Proceffes, to give fome light into the Bufinefs of Chemical Solution, Coagulation, Precipitation, Effervefcence, Acid and Alkali, Taftes and Odours, and the Production, Destruction, and Change of Colours. AND thus at length we finish our Account of this celebrated Work; having endeavour'd, as we went along, to give a fummary View of its feveral Parts. We have been the larger upon it, because great Expectations were formed of it, as coming from a very eminent Man, of long Experience in the Art, and now in the Prime of his Life for Judgment and Knowledge. We have a great Veneration and Esteem for the Author, and his other Works; but muft take the liberty to fay, that a better System of Chemistry might have been expected from him, who has practifed and publickly profeffed this Art for fo many Years; efpecially when he took a confiderable Time to publifh his own Work, after it had been officioufly and pyratically printed by others. The Defign is laudable and hoble; viz. the Inftruction of Beginners and Learners in Chemistry: but then the Book is not well fuited to this End; as being wrote in an affected and intricate Manner; not adapted to the Capacities of Learners; fo as in this refpect to fall fhort even of the furreptitious Latin Edition; and much fhorter of the English one, given fome Years fince from that. Upon the whole, the Author has fwelled his Work with many needlefs Repetitions; given us fcarce any thing new, or better defcribed than in other Authors; often dwells upon trifling Particulars; raifes many things beyond the Truth; fhews noCEconomy with regard to the due Diftribution and Printing and might, according to his own View, have reduced it to half the Size. 4 |