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240 Argillaceous Genus. acids. Heated to 120°, it hardened fufficiently to give fire with fteel, and grew perfedtly white, the outfide had a glazed femivitrified appearance, but the inüde a more diftindt unvitrified grain. 3d, Another from the fame fhop, whoie colour was ifabelia yelknv. Luftre, o. Tranfparency,. fcarceiy 1. Hardnefs, from 7 to 8. Sp. gr. 2,955. Did not effervefce with acids. At 120* it melted into a yellow porous enamel. . . 1 3. s 1 •• ! . 33m ' ■ ■ - ' . T > ' ■■■' - -z1&-$:■■■■■■: . ’ sec-