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210 be assumed, be of constant recurrence; for, as physical science advances, it will become more and more difficult for the same party to attain to a large and solid with the attributes of mind (abstractions, that is), and the knowledge of "external nature." The self-same differences, in fact, which were delineated so graphically by Aristotle, are still to be traced in our almost exclusive attention to the physical sciences, and our disinclination to admit, in our inquiries, of any proof but such as can be tested through and by the senses and observation. The terms here rendered physiologist and metaphysician (terms unknown, by the way, to Aristotle) in the Latin version are naturalis, and disserendi artifex; that of artisan is faber; builder, artifex; and transcendental philosopher is primus philosophus.

CHAPTER II.
Note 1, p. 19. Hence Democritus, &c.] None of the works of this eminent man have come down to us; but notices of his opinions lie scattered through the writings of Aristotle, and these may suffice for the elucidation of this and other allusions to him. Following his master Leucippus, Democritus, abandoning metaphysical , looked into the constitution of the external world for