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ciples are destroyed in the Operation, butthat every Individual be separated from eachother, and made to appear in its true na-tural State, and that in the strictest Sense:Under these Examinations, not only Mine-' ral Ores and Fossils are to be taken, b u t, all forts of Earths, Salts, Bitumens, Stones,and whatever else the Mineral World pro-duces frqm its Surface, even to its inmostRecesses, are in like Manner to be essayed.The Method also of Smelting Metalline orMineral Ores, by the Help of large burningGlasles, comes under the Science of Mine-,rology. In fine, it is not advisable to slophere, till we have acquired a perfect Know-ledge of all the different Strata or Layersof Earth, Stone; in ssiort, of all the Con-tents of the Mountains, even a Summo adImurn ; hence we learn, what is peculiar toevery particular Metal, and how each Mi-neral affects its neighbouring adjacent Rock,Stone, Earth, or whatever else lies contigu-ous to it, which with Diligence and La-bour, we can arrive to a certainty of, by theHelp of Chymistry, for the Exhalationsarifmg from Mineral Bodies, tinge thewhole even to the very Surface; so that iti$ not any way surprising, that a SkilfulMinerologist, by a bare Survey of the out-ward Soil, can determine what Mineral orFossil is contained underneath.

Some,