Abstract
About 31 cwt. of basalt was melted in a large double reverberatory furnace; and after a slow cooling during thirteen days, it presented an upper stratum of stony vesicular matter about 1 inch thick, next a layer of black glass from 2 to 8 inches deep on that side of the mass which was exposed to the air from the door of the furnace; elsewhere, immediately under the vesicular layer, was solid stone, interspersed here and there with air-bubbles. Mr. Hawkes added some observations relating to the results of experiments which he had made to ascertain the temperature of melted cast iron, and of melted basalt.
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