. Physical researches on sensation [by] Frank Allen [and others]. ly type I did not discover being violet-blindness. These curves are all reproduced in Plates I,II and III, and the classes to which the individual curvesbelong are indicated on the curves in accordance with thefollowing classification. Red-Green blindness—Two varieties. Class I Red-blindness. Class II III • Class IV , Class V Red-Violet VI Green-Violet VII Red-Green-Violet-blindness; or total colorblindness. Since Classes III and IV are really two subdivisions of thesame gene
. Physical researches on sensation [by] Frank Allen [and others]. ly type I did not discover being violet-blindness. These curves are all reproduced in Plates I,II and III, and the classes to which the individual curvesbelong are indicated on the curves in accordance with thefollowing classification. Red-Green blindness—Two varieties. Class I Red-blindness. Class II III • Class IV , Class V Red-Violet VI Green-Violet VII Red-Green-Violet-blindness; or total colorblindness. Since Classes III and IV are really two subdivisions of thesame general type, the seven classes include only six persistency curves for color-blindness bear a remark-able resemblance to those which we have studied for retinalfatigue, which is thus seen to be analogous to artificial orinduced color-blindness. As far as we may conclude from these cases the most com-mon types of color-blindness aie: red-blindness, red-greenblindness and red-violet blindness, which together comprise 36 PRIMARV COLOR SENSATIONS ALLEN. Figure 25. Departures oi Persistency Cur>es of Color-blind Personsfrom the Normal Persistency Curve. AMERICAN JOURNAL OF PHYSIOLOGICAL OPTICS twenty out of the twenty-six cases studied. Some of theOther types are evidently distinctly rare. Typical examples of these curves are shown also on thesingle diagram plan in Fig. 25, which exhibits the charac-teristic elevations in the clearest manner. It will be ofadvantage to compare this figure with the curves in Fig. 20which is described above. These curves for color-blindnessconfirm in the strongest and clearest manner the conclusionsalready reached from the experiments on normal eye regard-ing the number and designation of the fundamental colorsensation. One further problen in color vision may be fittingly re-ferred to in concluding this paper. On one occasion I fatigued WH ITE CURV E \ \ 1 \ \ \\ \ CO z 00 u \ / r \\ /. 1 V \ / // 013— \ ^ / / N. ^ ^ ^ > ^0,^^ e YE
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