[190a]
that sight joined to eyes makes those eyes the better for it, and further if we are able to get it joined to eyes, we obviously know what this faculty of sight is, on which we might be consulting as to how it might be best and most easily acquired. For if we did not know first of all what sight or hearing is, we should hardly prove ourselves consultants or physicians of credit in the matter of eyes or ears, and the best way
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