Duff, A. Wilmer (Alexander Wilmer), b. 1864, ed, Guthe, Karl Eugen, 1866-1915, Hallock, William, 1857-1913, Lewis, E. Percival (Exum Percival), 1863-1925, Goodspeed, Arthur W. (Arthur Willis), b. 1860, Carman, Albert Pruden, b. 1861, McClung, Robert Kenning, 1874- · Philadelphia, P. Blakiston's Son & Co · leaf 429
ly changes indiameter between the limits of about2 and 5 mm. The parts of the eye areshown in Fig. 294. 5 is the scleroticmembrane, the outer enclosure of theeye. C is the cornea, a strong trans-parent membrane. / is the iris, thecolored part of the eye, with a centralorifice, the pupil, which… … OPTICAL INSTRUMENTS AND MEASUREMENTS. 413 to the brain. Muscles attached to the periphery of the lens canby their contraction or relaxation so change its curvature as toenable it to focus either very distant or very near objects on theretina. This process is called accommodation. Two objects…
Physics
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