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In this book Aitken gives an intelligent statement of the essential knowledge of ultraviolet light and the elementary principles of its application in therapeutics. The first chapter is a brief historical account of heliotherapy; the next four chapters are devoted to the physics, chemistry, biologic and various other effects of the agent; the sixth, seventh and eighth chapters are concerned with the technic. Then, in succeeding chapters, the author takes up the various therapeutic applications. He is a dermatologist of extensive experience, and his judgment of the therapeutic indications and contraindications for the use of ultraviolet light in diseases of the skin leaves nothing to be desired. The consideration of the therapeutic application of the agent in other departments of medicine is equally satisfactory. Altogether, it is the work of a trained physician who writes with a background of wide clinical experience and sound judgment, as well as long and