mical phenomenon. The various vergence the tendenery to accommodate is also greatly which are } of aline in diameter, it may be stated that systems of such machines differ merely in the absolute controlled. V=28. When the next letters which are one-half At the extremity of the eye tube, and with… … fecting a great economy in the force required for work- Iron Pyrites. ERRORS OF REFRACTION. ing the pump. Pyrite, or iron pyrites, is one of the commonest of ter of its system, about 2 inches from the cornea. as it minerals, occurring in rocks of all geological ages froin ee en ee COMPOUND…
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