284 STUDIES OF NATURE. 



yellow, at an elevation of forty-five degrees ; the 

 fire colour, in the Zenith 3 the pure blue, forty- 

 five degrees under it, toward the Weft ; and, in the 

 very Weft, the dark veil of night ftill lingering on 

 the Horizon. At leaft, I think, I have remarked 

 this progreffion between the Tropics, where there 

 is fcarcely any horizontal refraâ:ion to make the 

 light prematurely incroach on the darknefs, as in 

 our Climates. 



J. y. Ronjfeau obferved to me one day, that 

 though the field of thofe celeftial colours be blue, 

 the yellow tints which melt away into it, do not 

 produce by that mixture the colour of green, as is 

 the cafe in our material colours, when thefe two 

 (hades are blended. But I replied, that I had fre- 

 quently perceived green in the Heavens, not only 

 between the Tropics, but over the Horizon of Pa- 

 ris. That colour, in truth, is hardly ever feen 

 with us, but in fome fine Summer evenings. I 

 have likewife feen, in the clouds of the Tropics, 

 all the colours perceptible on the earth, particu- 

 larly at fea, and in ftormy weather. You may 

 then fee fome of them copper-coloured, fome of 

 the colour of the fmoke of a tobacco-pipe, fome 

 brown, reddilh, black, gray, chefnut, livid, the 

 colour of a heated oven's mouth. As to thofe 

 which appear there in fine weather, fome are fo 

 lively and brilliant, that no palace can exhibit any 



thing 



