PHOTOTROPISM OF DIXIPPUS MOROSUS.
1. Local differences in the effects of stimulation of parts of the eye by light are expressed in Dixippus morosus by differential circus movements. 2. The angle of inclination of the body axis toward one source of light when the animal is on a vertical plane with light from one side is inversely proportional to the logarithm of the intensity of the light.
Yagi
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Laboratory of General Physiology, Harvard University, Cambridge.