. Physical researches on sensation [by] Frank Allen [and others]. ( 1 J 1 ii 1 ()l.)s 926 Frank Allen [ & , 7 These results show that all the depressions in the full curves pre-viously discussed in this paper are really comparable with curve C. Table 5. Curves for Wave Length .-ISOix Dim Light Daylight X Normal Adaptation Adaptation Sec. Sec. Sec. .590m .550 .0155 .0152 .0142 .530 .0165 .0163 .0150 When darkness and dim light adaptation are both completely removed,the depressions should properly be enlarged to nearly double the depth. Fig. 10. Reflex curve fo

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. Physical researches on sensation [by] Frank Allen [and others]. ( 1 J 1 ii 1 ()l.)s 926 Frank Allen [ & , 7 These results show that all the depressions in the full curves pre-viously discussed in this paper are really comparable with curve C. Table 5. Curves for Wave Length .-ISOix Dim Light Daylight X Normal Adaptation Adaptation Sec. Sec. Sec. .590m .550 .0155 .0152 .0142 .530 .0165 .0163 .0150 When darkness and dim light adaptation are both completely removed,the depressions should properly be enlarged to nearly double the depth. Fig. 10. Reflex curve for in order to represent fully the reflex enhancement of the color sensa-tions. It may also be inferred from Figs. 11 and 12, that enlarge-ment of the depressions will also sharpen their three-fold division. Nov., 1923] Reflex Nature of Color Contrast 927 As so much time ami labor had been expended in obtaining the curvesshown in this paper, the writer did not repeat the measurements underthe optimum condition of adaptation, contenting himself with the •ozo OOlS

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