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it from the others, cxliibiting at the parts of reparation a kind of 

 luminous appearanee, fo that each fpherical part was furrounded by 

 lix fides, as is fliewn in Jig. 11, A B C D. 



When I removed this tunica cornea a little from the focus of the 

 microfcope, and placed a lighted candle at a fmall dillance, fo that 

 the light of it mult pals through the tunica cornea, I then faw 

 through it the llame of tlie candle inverted, and not a fingle one, 

 but fome hundreds of flames appeared to me, and thefe fo dillind;- 

 ly (though wonderfully minute) that I could difcern the motion or 

 trembling in each of them. 



Dire6ling my view, through the fame tunica cornea, to the Ree- 

 pie of our new church, which I have meafured by a quadrant and 

 found to be two hundred and ninety-nine feet high, and I judge to be 

 about feven hundred and fifty feet dillant from my lludy, I law the 

 reprefentation of a great number of minute lleeples inverted, and 

 which feemed no larger than the point of a needle feen by the na- 

 ked eye. 



When I looked at the neighbouring houfes, I could fee, through 

 the tunica cornea, not only the buildings, but the doors and win- 

 dows, and could plainly diftingiufh whether the windows were Ihut 

 or open. 



It mull: be obferved that n\ Jig 11, A B C D, a very fmall part 

 only of the tunica cornea is reprefented, but to give an idea of the 

 whole of it, and to fliew the multitudes of the protuberances or 

 optical organs it contains, every one of which is a perfect eye, I 

 counted how many of thofe protuberances were contained in the 

 diameter of the whole tunica cornea, which amounted to about one 

 hundred ; but if we reckon them to be only ninety, the number of 

 optical organs in the whole furface of the tunica cornea will amount 

 to above eight thoufand. 



In the fame manner I alfo examined the eyes of a fly, and I per- 

 ceived the fame perfedion in the formation of the optical organs it 

 contained (though thefe were fmaller than in the dragon-fly) j and 



