[67a]
not being derived either from many or from simple forms, but are indicated by two distinctive terms only, “pleasant” and “painful” of which the one kind roughens and violently affects the whole of our bodily cavity which lies between the head and the navel, whereas the other mollifies this same region and restores it agreeably to its natural condition.The third organ of perception within us which we have to describe in our survey is that of hearing,
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