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SECOND PART OF THE system of mineralogy. CLASS IV. OF METALS or METALLIC SUBSTANCES. r .1 These fubftances are, according to the old theory, confidered as compound bodies com- pofcd of the metallic earth and phlogifton, or the matter which gives metals their luftre, and renders them more or lefs inflammable; and, according to the new theory, the metals are underftood to be Ample bodies, or bodies which cannot be decompofed, but which are liable to be changed by other bodies. When united to Yot. II. R