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such a Manner as to save a great deal ofFuel, for Fire is ever obedient to the Ar-tist.

‘ythly, He must be acquainted with every-other particular and manual Operation inthe smelting Business, that he may be ableto direct every Branch of it; for nothingcan be more evident, than that he is thegreatest General, that knows and is expe-rimentally acquainted with the Duty ofevery Individual that is subject to his Com-mand, from the meanest Centinel, to thehighest Officer.

6 thly, A Smelter must, by the Helps ofMetallurgy , and chymical Analysis , arrive toa Knowledge of the inward Texture ofMarcastes , Mondye, and such like Mine-rals, which in these Parts are called Sul-phurs ; he will find, that, by mixing themwith Lead Ores, they will frequently pro-duce noble Metals, which they will yieldto Advantage ; but, when tried by the Firealone, they will not afford any thing, butwill either turn to Scorice , or evaporate ;was it not for this Knowledge and Expe-rience, the Mines in Germany would notbe so considerable as they are; for it isoftentimes found, that eight or more Ofthese Fossils, which separately or singlywould not produce any thing, yet, beingdiversely mixed with Lead -Ore, their Pro-duce becomes considerable,

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