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A brief account of theories on the nature of the primary photochemical process in chlorine has been given.2. Earlier measurements and the data now obtained show that extreme drying of chlorine does not change appreciably either the structure of its absorption spectrum or the total amount of light energy absorbed.3. Measurements of a possible fluorescence in dry chlorine reveal that certainly less than 5% of the absorbed light energy is reémitted as fluorescence.4. It has been suggested, in order to reconcile these experimental results with the known influence of moisture on the Budde effect, that chlorine (or other halogen) is dissociated into atoms on absorption of light energy in the region of continuous absorption independently of its degree of purity; water is assumed to have a catalytic influence on the rate of recombination of the atoms and, therefore, also on the rate of thermal dissociation of chlorine molecules.Princeton, New Jersey