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[1].
- ↑ See chap. ccxv. and ccxvii.