Transactions . ^ S^S^tXiorv 0/ !UJjJiy^JiL, -VvcMiyrMU. S^/? jl - 3AE^ dbl.^ ox COLOR-TESTS FOR A^IETROPIA, BASED UPOXTHE CHROMATIC ABERRATION OF THE John Gkeex, , St. Louis, Missouri. The f()llo^ving brief paragraph from Dr. Thomas YoungsBcikerian Lecture, published in the PMlosojphical Transac-tions for ISOl (page 50), seems not to have received fromlater writers the attention it deserves: Dr. AYollaston mentioned [to me] a very elegant experi-ment for proving the dispersive power of the eye. He looksthrough a prism at a small lucid point, which of course be
Transactions . ^ S^S^tXiorv 0/ !UJjJiy^JiL, -VvcMiyrMU. S^/? jl - 3AE^ dbl.^ ox COLOR-TESTS FOR A^IETROPIA, BASED UPOXTHE CHROMATIC ABERRATION OF THE John Gkeex, , St. Louis, Missouri. The f()llo^ving brief paragraph from Dr. Thomas YoungsBcikerian Lecture, published in the PMlosojphical Transac-tions for ISOl (page 50), seems not to have received fromlater writers the attention it deserves: Dr. AYollaston mentioned [to me] a very elegant experi-ment for proving the dispersive power of the eye. He looksthrough a prism at a small lucid point, which of course be-comes a linear spectrum. But the eye cannot so adapt itselfas to make the whole spectrum appear a line; for, if the focusbe adapted to collect the red rays to a point, the blue will betoo much refracted, and expand into a surface ; and the reversewill happen if the e^e be adapted to the blue rays; so that, ineither case, the line will be seen as a triangnlar space. An observation by Wollaston, confirmed by Yoimg, needs noverification ; it is scarcely necessary to state tha
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectophthalmology, bookye
