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This is a personal book. Coming from Francis H. Williams, it represents the experience of one of the earliest workers in radiotherapy, with both roentgen rays and radium. Dr. Williams wrote a notable book on the subject thirty-five years ago, which was based largely on his own experience, and he has been working in the same field until the present. Unfortunately, only a few pages are devoted to diseases of the skin, but the whole is interesting to any worker in radiotherapy because of the record and wide experience of the author.