Sometimes alfo a good effect arifes, when 

 the fky, under the influence of a bleak north- 

 wind, cold and overcaft, is hung with blue, 

 or purple clouds lowering over the horizon. 

 If under that part of the atmofphere the 

 diftant foreft happens to range, it is overfpread 

 with a deep blue, or a purple tint from the 

 reflection of the clouds, and makes a very 



picturefque appearance. And yet I mould 



be cautious in advifing the painter to introduce 

 it with that full ftrength, in which he may 

 fometimes obferve it. The appearance of 

 blue and purple trees, unlefs in very remote 

 diflance, offends : and tho the artift may have 

 authority from nature for his practice ; yet the 

 fpectator, who is not verfed in fuch effects, 

 may be difpleafed. Painting, like poetry, is 

 intended to excite pleafure : and tho the 

 painter, with this view, mould avoid fuch 

 images, as are trite, and vulgar; yet he 

 (hould feize thofe only, which are eafy, and 

 intelligible. Neither poetry, nor painting is 

 a proper vehicle for the depths of learning. 

 The painter therefore will do well to avoid 

 every uncommon appearance in nature. 



Within this caution however he will fpread 



the prevailing tint of the day over his land- 



R 4 fcape 



