I Shall add on this Occasion somthing, that, tho’ not so odd as It, has yet an Affinity with the newly recited Case, and so may make it the more Credible. And it is, That I lately convers’d with a Mathematician, Eminent for his skill in Opticks, and therefore a very competent Relator of Phaenomena belonging to that Science? whose Organs of Vision are so constituted, that, tho’ in his Eyes I could discern nothing Amiss, and tho’ he makes much and excellent use of them in Astronomical Observations and Optical Experiments; yet he confesses to me, that there are some Colours that he constantly sees Amiss, and particularly Instanc’d in one, which in a clear day, (for so it was when we Discours’d together of this Matter) seem’d to him to be the same with that of a darkish sort of Cloath that he then wore, whil’st to Me and Other Men, it appear’d of a quite differing Colour.
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