Show X X X X Z X Z X Z X X X X X Z X Z X Z X Z 9 Y Y V V V Z V Z V Z V Za y Many Persons Unable to Distinguish Colors It is 18 a curious tact fact that thai color color blind blind of their persona person are ure not often aware defect detect of at vision Islon Even Eno scientific men meo I frequently fall fail to detect this defect In I themselves seh es esThe The following is a fu favorite theory to account acc for tor the cause luse of colorblindness color- color Is capable of It tour four blindness The eye ee distinct color blue yel yellow yellow el These arise urIbe however how how- and low red green sources each of 01 ever ner from tram only two which has hOI a double action producing the sensations lions of ot two complementary I of ot sensa colors One of at the sources lion corresponds to blue and yellow the other to red and green Mort Mon cobor col cob are deficient In 10 the or or blind people latter source of sensation and can distinguish therefore only blue and ond but yellow with their compounds sometimes the reverse U is the case The number Dumber of persons afflicted In this way Is much larger than thaD Is II Co com Om commonly n- n I support support-d. The average Is II said to 10 be one In 10 every 23 25 men Women are rarely troubled with colo ness |