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272 elsewhere, Aristotle, in his criticism of the theory adopted by Diogenes and Anaxagoras to account for the of fishes, has clearly distinguished the one from the other. He objected also to Timæus and some others who had maintained that expiration must precede the other. Enough, however, that he perceived, although with the parts on which odours impinge, or the organ by which they are made sensible, that they could gain access to the sense only through inspiration.

CHAPTER VIII.
Note 1, p. 100. Sound of the actual kind is the, &c.] As sound is the result of percussion, the passage implies something to be percussed, as well as something in which that which percusses is to move; but what that is in which percussion is to be made is not explained. Some commentators, as Simplicius, have considered the words ἐν τινι to imply, "the air which is interposed  between the sonorous body and the sense," and which, but for the contradictory opinions of that age with respect to the air, might be at once accepted as its meaning; and even taken as some special medium, as has been suggested, it still may signify a body of air. We