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in E; and it will also be brighter, because it is nearer to the part which gives them light. According to the 6th rule^[1], which says, that part of the body is to be the lightest, which is nearest to the luminary.

Chap. CCXIX.—Of the Termination of Reflexes on their Grounds.

The termination of a reflected light on a ground lighter than that reflex, will not be perceivable; but if such a reflex terminates upon a ground darker than itself, it will be plainly seen; and the more so in proportion as that ground is darker, and vice versa^[2].

Chap. CCXX.—Of double and treble Reflexions of Light.

Double reflexes are stronger than single ones, and the shadows which interpose between the com-

1. This was intended to constitute a part of some book of Perspective, which we have not; but the rule here referred to will be found in chap. cccx. of the present work.
2. See chap. ccxv. and ccxvii.