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260 ==CHAPTER V.== Note 1, p. 84. In our treatises upon action and , &c.] Some commentators have, in the treatises here alluded to, seen only a reference to other disquisitions, as those upon "'reproduction and destruction,' or decay," περὶ γενέσεως καὶ φθοράς; but as the passages which are cited do not meet the whole question, it has been suggested by Trendelenberg that the allusion may be to some other work which has not come down to us.

Note 2, p. 84. It is difficult to understand, &c.] In another chapter of this treatise, Aristotle has alluded to the power possessed by the senses of recalling former impressions; of realizing images at will, that is, without external objects. But the question here is to learn why the senses, which were supposed to be derived from the elements, from which or the accidents of which sensation itself was derived, are not in constant activity. The answer is, that the normal state, so to say, of the is potentiality, and that it is insusceptible,, of perception, without impression by something from without to call it into action; just as the combustible material requires, in order to burn, the agency of fire. But the comparison contains a converse proposition, as while the material is required for the sensibility, it is fire,