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To what extent these zeolites may be hereafter worked with profit it is impossible at present to say, for much may depend upon water supply, by means of which the ore would be crushed and washed, and much on the varying quantities of gold present in samples from different localities.

'The roof and sides of the cave were decorated with most superb icicles, crystallised in every possible form, many of which rivalled in minuteness the finest zeolites; while from the icy floor rose pillars of the same substance, assuming all the curious and phantastic shapes imaginable, mocking the proudest specimens of art, and counterfeiting many well-known objects of animated nature.

Through this and other masonry the hot waters have been percolating for centuries, and have given rise to various zeolites apophyllite and chabazite among others; also to calcareous spar, arragonite, and fluor spar, together with siliceous minerals, such as opal all found in the inter-spaces of the bricks and mortar, or constituting part of their re-arranged materials.

The Zeolites, above mentioned, so named from the manner in which they froth up under the blow-pipe and melt into a glass, differ in their chemical composition from all the other mineral constituents of volcanic rocks, since they are hydrated silicates containing from 10 to 25 per cent of water.

La zéolite est très-commune dans certains laves de l'Ethna; il seroit peut-être possible d'y en rencontrer des morceaux aussi gros que ceux que fournit l'isle de Ferroé. Quoique cette substance semble ici appartenir aux laves, je ne dirai cependant point que toutes les zéolites soient volcaniques, ou unies

They are chiefly of Russian extraction, and many of them natives of Archangel." EMMA. "The Ferroe Isles, belonging to Denmark, are seventeen in number; they produce agate, jasper, and beautiful zeolites, and export feathers, eider-down, caps, stockings, tallow, and salted mutton." CHARLES. "I do not think that can be very nice: I wonder who buys it?"