Page:A Treatise on Painting.djvu/239

 than in merely drawing the lines of it. The proof of this is, that the lines may be traced upon a veil or a flat glass placed between the eye and the object to be imitated. But that cannot be of any use in shadowing, on account of the infinite gradation of shades, and the blending of them, which does not allow of any precise termination; and most frequently they are confused, as will be demonstrated in another place.   first object of a painter is to make a simple flat surface appear like a relievo, and some of its parts detached from the ground; he who excels all others in that part of the art, deserves the greatest praise. This perfection of the art depends on the correct distribution of lights and shades, called Chiaro-scuro. If the painter then avoids shadows, he may be said to avoid the glory of the art, and to render his work despicable to real connoisseurs, for the sake of acquiring the esteem of vulgar and ignorant admirers of fine colours, who never have any knowledge of relievo.   bodies are of two sorts: the one has the surface curvilinear, oval, or spherical; the other has Rh