In order to determine the accuracy of Mr. Eda's apparatns for measuring the intensity of ultraviolet light based on the fluorescence principle, a comparative study was done in two methods.
One was the cadmium photocell method reported in one of the author's previous papers and the other the fluorescence method, the apparatus used being that of Mr. Eda. A quartz-mercury lamp was used as the light source. As the result of the experiments, the author got the conclusion that the limit of error in the lower range of measurement in the fluorescence method might. be taken for some fifty per cent or less. In the higher range, the accuracy was expected to be far better, but the experiment not having been carried out therein, the data were insufficicnt to express it clearly.

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