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This volume is on physiology, optics, methods of examination and bacteriology. The subjects are treated under the following headings: physiology of the nutrition and of the circulation of the eye, by Otto Weiss (Königsberg) ; morphologic changes of the retina through light, by K. von Hofe (Cologne) ; visual purple, by R. Dittler (Marburg) ; chemical changes in the retina, by the same author ; electrical changes in the organ of vision, by A. Kohlrausch (Tübingen). Comberg (Berlin) treats the light sense in a chapter of 111 pages. After a general physiologic introduction, the author describes the various perceptions of the light sense and its disturbances and methods of examination. Color vision is treated by Dr. R. Helmbold (Danzig). Then follow: theories of light and color sense, by Dr. R. Helmbold (Danzig) ; theories of adaptation, by H. K. Müller (Basel) ; physiology of space perception, by R. Dittler (Marburg). Refraction and accommodation make up an