A text-book of physiology, for medical students and physicians . Fig. 148A—Black and white disc for ex-periment on contrast.—{Rood.) Fig. 148B.—Showing the result when thedisc A. is set into rapid rotation.—(Rood.) ficial or the killing effect of different colors when brought intojuxtaposition. Color Blindness.—The fact that some eyes do not possessnormal color vision does not seem to have attracted the attentionof scientific observers until it was studied with some care by Dalton,the distinguished English chemist, at the end of the eighteenthcentury. Dalton himself suffered from color blindne
A text-book of physiology, for medical students and physicians . Fig. 148A—Black and white disc for ex-periment on contrast.—{Rood.) Fig. 148B.—Showing the result when thedisc A. is set into rapid rotation.—(Rood.) ficial or the killing effect of different colors when brought intojuxtaposition. Color Blindness.—The fact that some eyes do not possessnormal color vision does not seem to have attracted the attentionof scientific observers until it was studied with some care by Dalton,the distinguished English chemist, at the end of the eighteenthcentury. Dalton himself suffered from color blindness, and theparticular variety exhibited by him was for some time describedas Daltonism, but is now usually designated as red blindness. Thesubject was given practical importance by later observers, espe-cially by the Swedish physiologist Holmgren,* who emphasized itsrelations to possible accidents by rail or at sea in connection with * Holmgren, Color Blindness in its Relations to Accidents by Rail andSea, Smithsonian Institution Reports, Washington,
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