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250 entertained amid inquiries into corporeal functions and sympathies; and the chief object of this treatise, is to ascertain what that principle is which, for a stated time, animates and presides over the functions of reproduction, nutrition, growth and decay. It is evident, besides, that Aristotle has annexed, so to say, this high privilege to the mind, as the seat and source of all moral and intellectual qualities and faculties.

CHAPTER II.
Note 1, p. 64. It is not only correct that the , &c.] Aristotle makes a definition to be a term significant of what a thing essentially is, and, thus a may be employed in place of nouns, or one  for another; but a noun cannot be accepted as an adequate definition, since every definition ought to involve some kind of cause. It is an expression, in fact, which so explains any term as to distinguish it from all else, as a boundary line separates fields. Aristotle, again, makes it to be something laid down (θέσις μὲν ἐστι) as the lays down the unit as indivisible, quantitatively considered; and yet this is no hypothesis, since the unit,