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The physics and technique of grenz radiation are outlined. The effects of this type of radiation on the cell nucleus and cytoplasm are described, and, finally, the histological changes which take place in the skin after radiation. The last half of the book is concerned with the use of grenz rays in various dermatological conditions. There is a short chapter by Felix Sagher and J. Landau on grenz ray therapy in ophthalmology. It is not apparent that grenz rays have much applicability to ophthalmologic conditions, and the book will therefore have slight appeal to ophthalmologists.