Page:A Treatise on Painting.djvu/336

 studies will be very useful if managed with judgment, where they may be wanted in the offscape of a picture. I have observed that the second tree is less by four fifths than the first, at the distance of thirteen yards.   superficies of any opake body participates of the colour of the transparent medium interposed between the eye and such body, in a greater or less degree, in proportion to the density of such medium and the space it occupies.

The outlines of opake bodies will be less apparent in proportion as those bodies are farther distant from the eye.

That part of the opake body will be the most shaded, or lightest, which is nearest to the body that shades it, or gives it light.

The surface of any opake body participates more or less of the colour of that body which gives it light, in proportion as the latter is more or less remote, or more or less strong.

Objects seen between lights and shadows will appear to have greater relievo than those which are placed wholly in the light, or wholly in shadow.

When you give strength and precision to objects seen at a great distance, they will appear as if they were very near. Endeavour that your imitation be such as to give a just idea of distances. If the object Rh