Show thees sees kinship between vitamins and ats vision ton P the manner in which the eye works particularly how it perceives what one knows as color Ls a very considerable my mystery the puzzle Is f 1 not very much clarified clarf fied but Is pos made more interesting by the recent discovery that there Is a close rotation relation between vitamin A and the of 0 I sual purple lu in the E retina Is it has long been known that visual 1 purple plays an important tart part la in the functioning of tile the re rods roda la is sensitive to light y bleaching to a colorless material when exposed to illumination ji watching this phenomenon dr it george wald at tho the oceanographic woods hole mass dis fc covered that when the purple be comes transparent a slightly material Is split oft off from it material a hitherto unknown chem leal ical was found to be closely relate 1 to carotene which in turn Is a close relative of vitamin A doctor wald then actual actually lv wit jessed the transformation of tile the new yellow substance into Itaru ln A literary digest |