Opticks : or, A treatise of the reflections, refractions, inflections and colours of light . hey are letpafs. So the Infuiion of Ugmm Nephriticum (as B O O K I. 167 (as I have alfo tried) when held in this beam ofLight XY, looks blue by the reflected Part of theLight, and red by the tranfrrjitted Part of it, aswhentis viewd in Day-light j but if you intercepcthe blue at the Lens the Infufion will lofe its re-fled:ed blue Colour, whilft its tranfmitted red re-mains perfect, and by the lofs of fome blue-making Rays, wherewith it was allayd, becomesmore intenfe and full. And, on the contrary, ift
Opticks : or, A treatise of the reflections, refractions, inflections and colours of light . hey are letpafs. So the Infuiion of Ugmm Nephriticum (as B O O K I. 167 (as I have alfo tried) when held in this beam ofLight XY, looks blue by the reflected Part of theLight, and red by the tranfrrjitted Part of it, aswhentis viewd in Day-light j but if you intercepcthe blue at the Lens the Infufion will lofe its re-fled:ed blue Colour, whilft its tranfmitted red re-mains perfect, and by the lofs of fome blue-making Rays, wherewith it was allayd, becomesmore intenfe and full. And, on the contrary, ifthe red and orange-making Rays be intercepted atthe Lens, the Infufion will lofe its tranfmitted red,whilft its blue will remain and become more fulland perfedl. Which fhews, that the Infufiondoes not tinge the Rays with blue and red, butonly tranfmit thofe mofl copioufiy which werered-making before, and refledts thofe moft copi-oufly which were blue-making before. And afterthe fame manner may theReafons of other Phaeno-mena be examined, by trying thorn in this artificialbeam of Light M 4 THE
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