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Evidence has been accumulating that the polarized-light sensitivities of various single ommatidia in the Limulus eye were different and that even the same ommatidium might show altered responses under changed conditions. Since the orientation of the optic axes of these units varies widely from one place to another in the eye, the most likely parameter concerned here seemed to be the incident angle of the stimulus. Consequently, experiments have been initiated to test the effect of this factor systematically. The general results so far obtained with nonpolarized

POLARIZED LIGHT AND ANGLE OF STIMULUS INCIDENCE IN THE COMPOUND EYE OF LIMULUS