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THREE-DIMENSIONAL MOTION PICTURES 39 the year 1670, proved his theory on the composition of light by pasting strips of paper of the colors of the spectrum on a cardboard disc, the dimensions and po sitions representing five spectra covering the whole surface of the disc. By rotating the disc by mechanical means the different colors blend and a uniform tint can be seen which changes according to the speed of rota tion of the disc. When the disc is rotated at a certain high velocity the disc appears white thus proving that white light is formed by the fusion of all the colored lights of the spectrum. Newton's disc proved the physiological fact that the impression on the retina always last longer than the stimulus (source of light) and that if a new impression is allowed to be formed before the previous is com pletely extinguished an impression consisting of the blending of the two is obtained and, furthermore, that several impressions can be made to react simultaneously on the retina. In the case of Newton's disc the seven colors of the spectrum, multiplied by five, represented thirty-five stimuli making an impression on the retina simultaneously. Plateau, in 1849, investigated the duration of the per sistence of vision and although, as previously stated, it varies according to the intensity of the stimulus and to the sensitiveness of the retina, he placed it at as long as 30 seconds, as an average. Further investigation proved that the impression on the retina is not immediate; it gradually increases until it reaches a maximum and then gradually decreases to disappearance, so when stimuli are made to react on the retina even in rapid succession, they quite har moniously blend into each other. The action of the retina is nevertheless extremely rapid and the normal eye can perceive a flash of light, such as an electric spark, having a duration of only 1/8,000,000 of a second. In such short duration the im-