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t « 1 former ftate by fufion, are metallic, or metals, taken in a general fenfe. 7. Thofe mineral fubftances, which, under the above circumftances, will keep their original texture in the fire, in oil, or water, are of a terreous principle; which, when friable, and mixing with water into a kind of pafte, are earths; if more folid or indurated, they are STONES. 8. It muft be obferved, in general, that metallic fubftances am commonly very ponderous, ftiining, fometimes of a very regular ftru&ure, and of very bright colours. 9. All mineral fubftances, therefore, may be re duced, according to the above experiments, to the following dalles; I. Earth, which contains both earths andftones-, II. Salts; III. In flammables ; and, IV. Metals. xo. Stony or earthy bodie 0 , mixed with faline, or inflammable, or metallic particles, are called ores : fometimes the ftony or earthy bodies are mixed with one, fometimes with two of thefe fubftances, fometimes with all. In thefe cafes, the rule takes place, a potiori fit denom'matio (i. e. you muft call it after the moll prevailing fubftance); which muft be underftood both of the greater quantity, and or the value of the predominant fubftance. SECTION III. On Earthy and Stony Subjlances. EXPERIMENT IV. 11. IF a few drops of a mineral acid, viz. the vitriolic, nitrous, or muriatic, be poured on an earth or itone, and the acid begins to dif- folve t