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xvi alone. The time has more than come, when it must devise new methods and new problems, and appropriate to their solution, all the aids that theoretical mechanics, including those of undulations, physics, and chemistry can afford; and the geologist of the coming time, who shrinks from mastering these, though he may continue a labourer, shall be no “light bearer” in the rising palace of cosmical truth. More or less, it is the Author’s hope that these volumes may be ancillary to promoting and giving direction to such a result.

London, October, 1862.