The objective during the first quarter was to design and procure the photometric instrumentation and to investigate empirically the response of typical known chemiluminescent reactions to solvent variation, catalysis, and, to a lesser extent, the addition of sensitizers. For this purpose, representative bright and feeble chemiluminescent reactions were chosen. The major effort in the first class was devoted to the oxidation of lucigenin, extending the work of Weber. As a result of checks for background radiation, it was confirmed that the observations of Vassilev and Stauff of widespread feeble chemiluminescence accompanying oxidation reactions applied to many presumably quite pure organic solvents. It was also found that Vassilevs and Chandross observations of sensitized increase of emission of many orders of magnitude apply to one system investigated acetone. Tetrahydrofuran THF is a more efficient catalyst for lucigenin chemiluminescence than previously investigated organic substances. Furthermore, the chemiluminescent decomposition of alkaline peroxide in the pressence of THF is extraordinarily bright, being readily visible to the eye, in the absence of sensitizers. A feature of many of the solvent system oxidations investigated is a post-peak emission recovery phase that, in some cases, results in a two-fold rise in the post-peak luminescence. This result suggests that the search for and isolation of reaction intermediates in these systems would be fruitful.