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SIR, Soho, April 10, 1804. The important geological consequences that seem deducible from the changes of texture developed by Sir James Hall 's very judicious experiments on the regulated cooling of melted basalt, induced me to attempt a repetition of them, some time after the publication of his interesting and ingenious paper.

philosophical transactions of the royal society of london

XI. Observations on basalt, and on the transition from the vitreous to the stony texture, which occurs in the gradual refrigeration of melted basalt; with some geological remarks