Examining a Gentleman, that was already Almost Blind, and fear’d to grow Altogether so, about the Symptoms of his Disease, (which came with a Stroke upon his Head) I found, as I expected, by his Answers, that, tho’ he could not any thing well distinguish Objects of Other Colors, Yet he could well perceive those that were White, to be of That Colour. Which confirms what I mention in the History of Colours, concerning the great Quantity of Light, that is Reflected by White Objects, in comparison of those that are otherwise Colour’d. And this Observation it Self was confirm’d by another Patient, who, tho’ almost Blind, could yet discern White Objects.
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