It is foreign from the present purpose to enter on any history of the systems that, since the rise of this branch of science, have been invented to explain the phenomena of the mineral kingdom. It is sufficient to remark, that these systems are usually reduced to two classes, according as they refer the origin of terrestrial bodies to fire or to water; and that, conformably to this division, their followers have of late been distinguished by the fanciful names of Vulcanists and Neptunists. To the former of these Dr Hutton belongs much more than to the latter; though, as he employs the agency both of fire and of water in his system, he cannot, in strict propriety, be arranged with either.

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