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CH. II.] "vowels and consonants, which constitute speech, to the larynx, tongue and lips," seems, by this variety of sounds, to consider voice as a kind of harmony; and Cuvier says, that all the modifications of sound which are expressible by the letters of the alphabet, "take place in the mouth, and depend on the relative mobility of the tongue, and still more the lips, whence the perfection of man's speech is derived."

Note 5, p. 138. But since we judge of white, sweet,  and each other, &c.] The only answer to this, as it was to a former inquiry, is, that the brain is that faculty, and that it fulfils all the conditions, however enigmatically described, which are required in the text. It is impossible to refuse to the brain the property of receiving and comparing contrary impressions,, and receiving them, therefore, in the words of the text, as an indivisible principle, just as the mind can compare opposite ideas; and all the speculations upon impulses and the divisibility and indivisibility of that which is to perceive and judge only shew the want of a central organ for the reception and comparison of sensations. And many of these passages are necessarily obscure, owing to their partaking of the character of inquiry or suggestion, rather than didactic statement; but their obscurity may be, in part, seen through by the introduction of that source of sensibility, which is said, in the closing paragraph, to constitute animal in contradistinction to mere vegetive life.