Includes music.

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Excerpt from The Factors That Influence the Sensitivity of the Retina to Color: A Quantitative Study and Methods of Standardizing; A Dissertation Presented to the Faculty of Bryn Mawr College in Partlal Fulfilment of the Requirements for the Degree of Doctor of Philosophy In order to determine as accurately as possible to what degree, if at all, the intensity of the after-image excitation is decreased by adding to the stimulus color a brightness excitation unfavorable to its saturation, the second study of the series was begun in 1909. It was entitled: The Fusion of Colored with Colorless Light Sensation: The Physiological Level at Which the Action Takes Place. An abstract of this article was published in the Journal of Philosophy Psychology and Scientific Methods, 1911, VIII, pp. 294-297. The full report will shortly be published in the Psychological Review. The results of this study have a twofold bearing. (1) They make plain once for all why it is possible to Obtain color in the after-image when none is sensed in the stimulus, for they show that the intensity of the after image excitation is not decreased at all by adding to the stimulus color a brightness excitation unfavorable to its saturation. (2) They throw some light on the broader problem presented by the fusion of brightness and color. By serving to indicate the level at which this action takes place, they help, for example, to explain a number of somewhat puzzling phenomena attendant upon the fusion of brightness with color, in case of positive, after-image, and contrast sensations. This action takes place apparently postenior to the seat of the after-image and contrast processes and the cancelling action of the complementary colors. There are two effects of the fusion of brightness with color, both of which are pressed into service in drawing the above con clusion: (1) it reduces the saturation of the color sensation; and (2) it changes the quality or tone of certain colors. This con elusion is based on the following lines of argument. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.