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LIX. Account of an Experiment in isoJiichpart of the interior 

 of the Eye is exhibited by Rejection in the Eye-glass of a 

 Telescope*. 



THE account of Dr. Purkinje's experiment in the Septem- 

 ber Number of the Philosophical Magazine has induced 

 me to record the following fact, which bears some analogy to 

 it and which has been too often remarked and too carefully 

 examined to admit of any doubt as to the circumstances. 



Beino- in the habit of occasionally looking at the sun through 

 a very "fine and powerful achromatic telescope, I have fre- 

 quently been unable to distinguish the spots, being per- 

 plexed by what appeared the reflection of some part of my 

 own eye, interposed between it and the sun ; and this, whe- 

 ther the eye approached the telescope as closely as possible, 

 oi- was withdrawn to some little distance. 



I could not believe that it arose from the eye becommg 

 dazzled by the light, because it was capable of bearing a much 

 intenser application and far stronger glare without fatigue, 

 and of looking immediately from the object in question to the 

 white paper on which I delineated it. 



On reading the passage in Sir D. Brewster's communication, 

 as above, p. 173, I immediately recollected, that though three 

 differently coloured glasses had been used for the sun, it was 



• Communicated by the Rev. T. J. Hiisscy. 



