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there are some imperfections, the essential facts are matter of undisputed Evidence. There can be nothing in the nature of Revolution, strictly speaking, till the third condition, in which it is presumed that the unequal expansions of the in terior fluid where producing mountains during the progress of cooling: while 1 must here mark, as evidence of such a proceeding, that the Moon presents this very character; being evidently a globe with a solid irregular surface most obviously produced in this manner, at very different periods, without stratified rocks, and, thence, rocky, through the cooling of fluids alone; while the evidence, not merely for the fact, but for the progression, and for its very cause, is seen in its volcanoes, successively produced, and still occasionally active. If such expansion, with effusion of igneous rocks, is thus the cause of the subsequent Revolutions, so, from the third form of the earth onwards, it becomes de monstrated, and as to each successive one, with some hesitation perhaps as to the lignites, by facts which no philosophical geologist now disputes, though I have here multiplied the number; yet, in no case, without the same evidence. It is sufficient to say, that the immediate demonstration rests in the volcanic rocks, and in the effects of their powers on the stratified ones; and that the various analogies, both in the pro duce and in the effects, extend this absolute and visible evidence, retrogressively, though the whole system. Where that evidence was formerly doubtful or dis puted, I have now also completed it; by tracing the whole of the expansive actions backwards from the Coral islands, and by showing that there are a suf ficient number of distinct productions of igneous rocks, succeeding each other at intervals of time, to