The construction of a simple ultraviolet illuminator for the observation and photomicrography of fluorescence reactions on polished surfaces is described. The relative intensity and distribution of phosphorescing components are recorded by contacting the irradiated section against photographic emulsions. An exact replica of the fleeting phosphorescence is secured by the use of color sensitive film as the contact medium. The methods are serviceable in securing contrast between different components of the section and facilitate their identification by auxiliary tests.

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