In the absence of positive evidence, it is perfectly justifiable to reason, analogically, upon facts and principles, well ascertained by experiment and observation; always bearing in mind, however, that there are probably many agents and agencies, of which we are still ignorant, and that the discovery of some new power, or of some new mode of operation in those already known, might, very materially alter, nay, perhaps entirely subvert conclusions, in which we have been accustomed to repose unlimited confidence. Such a train of thought is far from being agreeable, for we are always prone to reason, on every subject, as if we understood the whole matter; but, the history of science has abundantly proved that philosophy, after building splendid systems, has, in consequence of its own discoveries, been often obliged to return to the humble task of learning its elements anew. The arrangement implied in the following sketch is, it will be perceived, founded upon the great outlines of the Wernerian plan. Whatever may be the errors and imperfections of that system, for it undoubtedly has both, its great outlines still appear to be founded in truth, and to present the best clew to conduct the young pupil through the labyrinths of geology. It has become fashionable to decry Werner; but, without being his blind admirer, I may be permitted to ask, who has done more for geology, and who has done it better? The author of this sketch begs leave to add, that, desirous of following truth only, he has kept himself disentangled from the prevailing geological systems; and, although trained in geology principally atE dinburgh, in the schools both of fire and water he is neither Wernerian nor Huttonian, Neptunian nor Plutonist; but simply a student of facts a learner, from those who certainly know more, and a teacher to those who may possibly Hope, Playfair, Murray, Hall, Jame
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