I have hitherto purposely omitted to speak of the eye, which has so great a share in the beauty of the animal creation, as it did not fall so easily under the foregoing heads, though in fact it is reducible to the same principles. I think, then, that the beauty of the eye consists, first, in its clearness; what colored eye shall please most, depends a good deal on particular fancies; but none are pleased with an eye whose water (to use that term) is dull and muddy.17 We are pleased with the eye in this view, on the principle upon which we like diamonds, clear water, glass, and such like transparent substances. Secondly, the motion of the eye contributes............