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CH. XIII] all sensual impressions to the one impression by contact, and this generalisation is supported by some modern writers and regarded as the theory of Sensation. "There may, however, be many other impressions derived from outward bodies, for which the sensitive nerves of the lower animals are adapted, besides those which affect us, and we cannot always be certain of the identity of the feelings communicated to them by organs which appear analogous to our own."

Note 3, p. 193. On which account, other sentient, &c.] This is consonant with the opinion that the Touch is the only sense necessary to animal existence; although the organs of relation are required for the higher forms of being. Thus, impressions in excess upon those organs, whether by colour, sound, or odour, may injure or pervert the senses, but cannot further affect the individual; while tangible impressions, hot, cold, or hard, can together with the sense destroy the animal.

Note 4, p. 193. Animals, in fact, possess...the other senses, &c.] This is referrible, of course, only to the higher orders of animals, as they alone require such organs for the exercise of their faculties, and the enjoyment of their existence. The Tongue is here introduced, whether by inadvertence or in submission to common opinion, as if it were a sense, or the sole organ for speech; and yet, as the chief of the organs for taste