Abstract
This is report of series of tests made on six persons, over period of several months, with the aid of photometer measuring the critical of flicker. The apparatus consists essentially of disk with sector cut out, rotating in front of light source until the flickering impression gives way to sensation of continuous light. This method has been employed to determine the brightness of different parts of the spectrum, and has been used by number of observers to test the behavior of the eye under different states of adaptation. The critical is expressed in flashes per second ; the expression a rise in critical frequency means an increase in the number of flashes per second necessary to produce fusion. The subject is seated inside cube with white walls measuring 152 cm., on which were several fixation points
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