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these sulphureous Bodies, so called, thatPart of Metallurgy, which appertains tothe Art of mixing, is chiefly concetned ;and the Accomplishment of a Smelter veryrtiuch depends upon a judicious Skill there-in. This is sufficiently evident from theEffects of mixing Lapis Calamimrn withCopper, which, by itself, cannot be broughtinto any metallise State.

Many Instances Of this Nature blight bealledged ; but this, I suppose, will be suf-ficient to make you agree with me, thatthis well known Experiment deserves theAttention of the most diligent and curiousSearcher into Metallurgy ; because itproves, ] st, that, by Mixture, a metallicQuality is produced, which Could not beobtained from the Lapis Calamhmris alone ;zdly, By this, it evidently appears, thatMetals will take a Tincture; therefore Dr.Henkel very justly observes, how necessaryit is to try all metalline and mineral Oresby Mixture, according to the most com-mon mechanical Operations *.

jthly y A Lead Smelter, in particular,must always Observe, that as long as theMetal is in the Furnace, a sufficient Quan-tity of Phlogiston, or inflammable Substance,of an oily or greasy Nature, which con-tains no acid, is constantly to be added toD it ;

* Dr. Henkel’s lesser Mineralogy, published in the -German Language, p. 65.