Page:A Treatise on Painting.djvu/318

 clearer; and the higher they are, the more they will shew their variety of form and colour.   parts that are near in the fore-ground should be finished in a bold determined manner; but those in the distance must be unfinished, and confused in their outlines.   part of any object which is nearest to the luminary from which it receives the light, will be the lightest.

The representation of an object in every degree of distance, loses degrees of its strength; that is, in proportion as the object is more remote from the eye it will be less perceivable through the air in its representation.   part of a building seen through a thick air, will appear less distinct than another part seen through a thinner air. Therefore the eye, N, looking at the

 Rh