I344

In a Piece, where you introduce any Multitude of Figures, either of Men, or other Animals, observe, that their Parts appear so much the more obscure, as they are lower, and as they are further involved in the Croud. Now this is absolutely necessary; there being a less Portion of the Heavens, wherewith these Bodies are supposed to be illuminated, received within the lower Parts of the Space, between the said Bodies, than within those which are higher; as will appear from the following Example. Suppose A B C D an Arch of the Heavens, [Tab. 2. Fig. 7.] diffusing Light on the Bodies beneath, and M N two Bodies, bounding the space S T R H, included between them: It here appears evident that the Point F, must be less illumined than the Point E, the latter receiving Light from the whole Arch, A B C D, and the former only from a part of it, C D.