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Tlie fainter light of the moon caufes lil^ewife rainbows, but they 

 I lefs noticed oa account of their faint and weak colours ; I obferv- 



ed one with remarkably bright colours on June 29th,: 1773, ano- 

 ther on July 6th, the fame year^ and another on March 19th, 1775,. 

 when near the Cape of Good Hope. Ariilotle is^ I believe, the firit 

 who obferved this phenomenon* 



thirdly,, when the air is charged with ^oni^ vapours, and often^ 

 when they are frozen into fnow or fleet, there appears a Halo about 

 tlie fun or moon, which is by no means remarkable upon the 



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whole; but it has been- obferved that Halos precede high winds, 

 fqualls and often rain and fnow^ Though I had frequent opportu- 



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nities to fee this obfervation confirmed, I did not however always^ 

 minute it dov/n ia my journal; I find only the following memo- 

 ?andums. On February 2.5th, 1774., we iaw a large Halo about the 

 moon, and that very night came on fqualls with rain, and the next 



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morning we had the fame weather, with loud thunder claps. 



On. 



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ir^e 



Halo, 



,. ^ ....^ ..^,, occupymg 



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January 5th-,_ A., M'. 1775 



44" of the heavens, was feen about the fun, dark in the middle,. 



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bright and whitifh. with fome colours of the x^AvhoYi in. the circle 

 and we had rain,, and now and then fqualls.. 



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