He was the author of the popular
Handbuch der Physiologie des Menschen (Handbook of
Human Physiology), published in five volumes from 1904 to 1910. The following are a few of his many writings involving physiology of the senses: •
Die niederen Sinne der Insekten (The Lower Senses of Insects), 1892. •
Tafeln zur Diagnose der Farbenblindheit (Table for Diagnosis of Color Blindness), 1898. •
Die Lage-, Bewegungs- und Widerstandsempfindungen (Position, Movement and Resistance Sensations), 1904. •
Allgemeine Einleitung zur Physiologie der Sinne (General Introduction to Sensory Physiology), 1904. •
Methoden zur erforschung des licht- und farbensinns (Methods for the Exploration of Light and Color Perception), 1908. == References ==