This work begins with a chapter on the general principles of radium therapy and the technic of its application. The author bases its therapeutic applications on the following biologic reactions: necrosis, arteritis, analgesic effects and the alterative reaction, which are altogether nebulous, apparently even to the author. The alterative reaction, for example, is "that property which is responsible for good results in such conditions as eczema, tuberculous ulcers, tuberculous glands, and many other conditions which require only a small amount of irradiation." The physics of radium, which he takes up under mechanics of radium, are given two and a half pages. The pages containing the technic of application are practical and useful. Then, after nineteen pages of general consideration, he plunges into the various diseases, from Banti's disease to ringworm. Under every disease he repeats two paragraphs, in substance, as follows (I quote from acne): "Diagnosis is not discussed in