. Physical researches on sensation [by] Frank Allen [and others]. , an increase of the persistence in that part of the spectrum, No. 5.] PERSISTENCE OF VISION. 271 Wave Ic gth. Taijle V. Fv/ fctfit-lirJ ■ilh ri-fii (/. -j .520 it\. Persistence. Wave Uogth. Persistence. .400 u .0311 sec. .512 fi .0150 sec. .415 .0253 J .533 .0126 .438 .0206 .573 .0120 .460 .0187 1 .620 .0125 .475 .0176 .678 .0137 .492 .0164 .758 .0185 due to the tiring process. The maxinuiin increase of the persist-ence of tlie green is about i 2 per cent, which again coincides witli the increase in the persistence ofthe sam
. Physical researches on sensation [by] Frank Allen [and others]. , an increase of the persistence in that part of the spectrum, No. 5.] PERSISTENCE OF VISION. 271 Wave Ic gth. Taijle V. Fv/ fctfit-lirJ ■ilh ri-fii (/. -j .520 it\. Persistence. Wave Uogth. Persistence. .400 u .0311 sec. .512 fi .0150 sec. .415 .0253 J .533 .0126 .438 .0206 .573 .0120 .460 .0187 1 .620 .0125 .475 .0176 .678 .0137 .492 .0164 .758 .0185 due to the tiring process. The maxinuiin increase of the persist-ence of tlie green is about i 2 per cent, which again coincides witli the increase in the persistence ofthe same wave length when theeye was bhndfolded. The curvecoincides witli the normal in theyellow and red, but runs underit in the blue and \iolet. TheHering theor) would lead us toexpect the cur\-es to differ in thered ; the Voung-Helmholt/. inboth violet and red if they dif-ered at all. For if one sensationwere exhausted it is possible thatthe intensity of the remainingsensations might be increased,producing the effect noticed inthe blue and \-iolet, and a similar. 015 r —^S \ \\ 11 ■*- j WAVI LEf>< EYE FATIGUES »1TMOREEM. — ._ ■40// .70 Fig. 7. effect in the red. The same phenomenon will be noticed in twoother curves (see Figs. 8 and 9). though since it is but slight it maybe due entircK to experimental errors. Retina fati^iud tvith vioUt. The following values were obtained when the eve was fatieuedwith violet: 272 FRANK ALLEN. [Vol. XI. Table VI. Eye fatigued with violet (/^ = .400 ^). Wave length. Persistence. ■Wave length. Persistence. .403 // .0350 sec. .502 a .0122 sec. .410 .0287 .533 .0110 .423 .0227 .596 .0109 .434 .0198 .657 .0125 .443 .0188 .715 .0149 .454 .0161 • .758 .0176 .468 .0149 The data are plotted in Fig. 8 in comparison with the normalcurve. The only part of the curve affected is the violet, which shows
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