furnish a true explication of all phenomena of the actual world. This prodigious illusion—such we now think it—was already passing off from the mind of Europe, as a dark cloud, at the moment when Bacon, in formal terms, challenged it as a folly, and the parent of error. Since that time realities, one by one, have been coming into their due position in the room of dreams. This, with an allowance made for exceptional instances, may be affirmed concerning the physical sciences of this modern period.