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472 CALC GENUS. Compofed of dull dufty particles, which are alnioft always weakly cohering. Feels meagre, yet fine. Soils very much. Light, nearly fwimming; Chemical Characters. It efFervefces powerfully with acids, and is alfo completely diflolved in it. It is a ^compound of calcareous earth and carbonic acid. Geognostic and Geographic Situations. It is found in fiffures and holes of mountains com' pofed of floetz limeftone, and principally in Swit zerland. T 1 Obfetvation. It appears to be formed by meteoric water paffmg over limeltone rocks, and afterwards depofiting, holes and fiffures, the calcareous earth which it had diflolved in its courfe. SECOND
