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These are made by a gland-sponge up under the upper lid, so as to wash any dust or sand or other harmful speck out of the eye before it can hurt the sensitive eyeball. Now look at some one's eyeball. It is like the picture, isn't it? bright white around the edge and then a ring of color, brown or blue or gray; and inside the color-ring, or iris, a little round black hole that we call the pupil.
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