[ 143 ] 



moved to a little diftance from the eye, will 

 Jofe {by the interpofition of the air) fome of 

 their luftre ; and by being farther removed they 

 will lofe more of it, till they appear, a^ it 

 were, colourlefs : for if feveral men, cloathed 

 }n feveral very different and glaring colours, be 

 placed on a diftant mountain's edge, juft within 

 the utmoft reach of the eye, we may difcover 

 thefe men as pbjefts diftinft from each other, 

 jbut without; any other colour than what is caufed 

 by feeing them through a great fpace of greyifli 

 air ; fo that very diftant objeds may properly 

 be faid to have neither light, ftiadow, nor co- 

 lour. Any common obferver may perceive, 

 when he commands anextenfive profpeft, where 

 jthere are ranges of diftant hills one behind ano- 

 ther > that the moft diftant are of a flat, f^int, 

 bluifli colour, without any lighter Or darker 

 parts, and confequently without any diftind ob-^ 

 jedrs vifible on them ; therefore, if you would 

 make a pi6lure appear like nature, your great- 

 eft diftances muft be faint. Thofe hills, that lie 

 a little nearer, may fliew fome fmall diftindtion 

 between wood-lands and the bare furface of the 

 ground on others, ftill nearer, we may diftia- 



guilh 



