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I have endeavoured to present a connected, and, in a measure, continuous account of the subject of photo-chemistry in its modern development. Unification of the scattered elements of this subject is no easy task, in view of the almost inevitable contingency of actinochemical change with other thereby recognized and characterized alternations of material systems. There has resulted a delay, not without danger, in the attainment of independent status by Photo-Chemistry, having been for so long ancillary to her elder sister, thermo- and electro-chemistry, so that only by a masquerade, momentous both for theory and practice, as the science of radio-activity has this Cinderella of the sciences been accorded its due recognition.