. Physical researches on sensation [by] Frank Allen [and others]. tandard of reference, and plotting its lumi-nosities horizontally, the corresponding values of L for thegreen of X520/x, the blue of \460/x,, and the violet of\ 430 /x, can be plotted as ordinates so as to give curvesof equivalent luminosities. If the luminosities of thesecolours rise or fall at the same rate, the resulting curvesought to be straight lines. The data from the preceding-tables are arranged in Table III., and are displayed gra-phically in fig. 5. The three ciuves in the figure alike show the relativeincrease in bri
. Physical researches on sensation [by] Frank Allen [and others]. tandard of reference, and plotting its lumi-nosities horizontally, the corresponding values of L for thegreen of X520/x, the blue of \460/x,, and the violet of\ 430 /x, can be plotted as ordinates so as to give curvesof equivalent luminosities. If the luminosities of thesecolours rise or fall at the same rate, the resulting curvesought to be straight lines. The data from the preceding-tables are arranged in Table III., and are displayed gra-phically in fig. 5. The three ciuves in the figure alike show the relativeincrease in brightness of the green, blue, and violet lightscompared with the red, since they deviate from straightlines at the lower intensities. As the violet is approached itis to be expected that the phenomenon should manifest itselfover an increasing portion of the curve, as it does in the * Coloiu Vision, J. H. Parsons, p. Ibid., p. 98. \tsiun of Colours of Varyiny Intensity. 89 li^^iup. 1 his conliirns uiid (.-xtendis similar results obUiineilby Ki»nig. Fig. . JO 15 20 25 30 Luminosity Cor Red ACCSji. 35 45 11)00 •88a •;)87•J/H)117 •o;{(} •LKI76■00-J2•0U0J8 Reil X GG5 46-1•13-3 3:.i •J3J 16r. S-7 4-8 ;H(t J4 Tablk 111. Green X^JO G4(5 t;o-3 7-9 Sf) 4(i Blue A-4(;U/i. Violet X-43ti«L. L. IfiO14-912-49-27-24-42-824o i:> 494 74(13 12-521•)■•> My original iiitcntidii was only to obtain the curves for tiio|i(rsist(MUe of vision which aro shown in li^. 1. Considerationof the (lata ohtuincd, however, showed that they could boiitili/.cd in the various ways discussed in this paper. Thesenro largely the contirniation, as well as the extension, of tliewoik of other investigators, which is always desirable,especially when dilVerent methods of exp«4rimentation aroUMi\. This confirmation has an additional advantag«\ sinceit shows how coinplittdy reliable is the method of the criticalfrequency of flicker, or persistence of vision,
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