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T R EATISE o F Metals M i n e &c. C H A p. i. 0f j he tl Companions of Metals; and fird ' thereof ^ ^ ^ ^° eral Colours i ava? ;"'Tg Earth are reducible into one hefe f 0ur Kinds Qf Mixture-, V1Z . Metals, _ . Earth, or 0* With Metals cannot be U 6 * f ie P ara ting of tlerfcuuling the Nat* p J a ^‘ ce w ‘thout un- Natiirc of the other three, B (as