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may be assumed that all knowledge is beautiful and estimable; but as one branch may be more so than another, either because of the exactness which is requisite for its examination, or from its treating of objects more exalted and wonderful than any others, so, on both these accounts, we may reasonably assign the first place to an inquiry into Vital Principle. For the knowledge of it promises to contribute largely to all truth, and most especially to truth in relation to nature, since it is the origin, as it were, of living beings. The object of our inquiry, then, is to study and ascertain its nature and its essence, as well as its accidents, of which some seem to be its own peculiar affections, and some to belong to living beings, as original properties, through it.

Let us premise, however, that the attempt to attain to any certainty with respect to it is beset with almost insuperable difficulties; for as this has much in