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To read this book is convincing proof that Life Insurance companies can and will write at least one chapter of "Medicine." The life insurance business has developed into one of the great commercial enterprises of our time, and naturally has accumulated a tremendous amount of certain types of invaluable information, specially applicable to many problems in preventive and clinical medicine. The value of statistics and data depends on their source, their accuracy and the honesty and intelligence of their interpretation, and there is no source from which the volume is so great, intelligent experience in their use so available or where there is less excuse for dishonesty of interpretation as the great mass of information accumulated by life insurance companies. It is true that they deal largely with selected groups, but comparisons are made with other groups, with census figures and other statistics. It is already clearly shown that gains