Chap, i o.] Extraordinary Phenomena of Light. 285 



pie, blue, green, yellow, pale red ; in the outermoft, 

 pale blue and pale red. Hugens obferved one red 

 .next the fun, and pale blue at the extremity. Mr. 

 Weidler has given an account of one yellow on the 

 infide and white on the outlide. In France one was 

 obferved, in which the order of the colours was, 

 white, red, blue, green, and a bright red on the out- 

 fide *. 



Artificial coronas may be made in cold weather, by 

 placing a lighted candle in the midft of a cloud of 

 fteam ; or if a glafs window is breathed upon, and the 

 flame of a candle placed at fome diftance from the 

 window, while the operator is alfo at the diftance of 

 fome feet from another part of the window, the flame 

 will be furrounded with a coloured halo. 



I was once witnefs to a very pleating phenomenon. 

 The full moon was partly obfcured behind the ikirt of 

 a very thin white cloud, which, as it grew thinner to- 

 wards the edge, had the full effecT: of a prifm in fepa- 

 rating the rays of light, and exhibited the colours of 

 the rainbow in their proper gradations. 



When M. Bouguer was on the top of mount Pi- 

 chinea, in the Corclileras, he and fome gentlemen who 

 accompanied him, obfcrvcd a mod remarkable pheno- 

 menon. When the fun was juft rifing behind them, 

 and a white cloud was about thirty paces from them, 

 each of them obferved his own (hadow (and no other) 

 projected upon it. All the parts of the fnadow were 

 idiftinft, and the head was adorned with a kind of glo- 

 ry, confiding of three or four concentric crowns, of a 

 very lively colour, each exhibiting all the varieties of 

 the primary rainbow, and having the circle red on the 

 outfide. 



Prieftley's Hift. of Opt. p. 597. 



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