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resorting to philosophy, therefore, there is no safety except in the closeness and completeness of our observations; and let it be added, that there is no danger except in the reverse. Push speculation to its uttermost limits, and error is impossible, if we have attended rigidly to the facts which philosophy reveals to us: overlook perhaps but a single fact, and our reason, otherwise our faithful minister, and truly a heap of untold treasure, may be converted into a brood of fiends to baffle and destroy us.

The whole history of science shows that it is inattention to the phenomena manifested, and nothing else, which, in all ages, has been the fruitful mother of errors in the philosophy of man. Entirely in consequence of this kind of neglect have philosophical systems become vitiated. A taint enters into them by reason of the exclusion of certain essential particulars: and when the peccant humour breaks out, as it is sure to do sooner or later, it is strange that this incipient symptom of a cure is often mistaken for the worst form of the disease. Never was such a taint