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interrupted, without prejudicing the Work-men.

Ninthly , A Mine Director must knowthe different Methods of Ore dressing, andwashing by Stampers especially, that hemay be a Judge when it is made. fit for theSmelter; all Minerals and Fossils requireit, for, till that is done, they are hot mer-chantable, or ready for the Furnace ; be-cause, when they are first taken out ofthe Caverns of the Earth, they are inter-mixed with heterogeneous Matter, whichmust be separated from them, before theyare fit to undergo the Fire ; so, they arenot mistaken, who affirm, that Metals, Mi-nerals, &c. are conceived with theSeed of Corruptness as well as Men. ThisBranch of the Artj in this Part of theKingdom, calls aloud for a Melioration,which might easily be effected, consideringthe many Rivulets that offer their Servicein being instrumental to it; on these,Stampers might be erected, whereby thewhole Wast? might be dressed and cleaned,without being at the Trouble and Expenceof waffiing it five or six Times over, as Ihave often seen it done in North Wales , tomy great Regret. They have indeedStampers at some Smelting-houfes, bywhich they clean their Slags ; but eventhose might be improved to considerableAdvantage ; such Things as these belongB 3 to