[67e] and to the astringent particles which affect the tongue, and to all the heating particles which we call “bitter“1 with these “white” and “black” are really identical affections, occurring in a separate class of sensation, although they appear different for the causes stated. These, therefore, are the names we must assign to them: that which dilates the visual stream is “white” and the opposite thereof “black“2; and the more rapid motion, being that of a different species of fire, which strikes upon the visual stream and dilates it as far as to the eyes, and penetrating
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