The recent great emphasis on mechanical and laboratory aids in medical practice will naturally stimulate an occasional writer to stress the simple (and perhaps nowadays often forgotten) clinical principles of diagnosis and treatment. The present book comprises the writer's thoughts on practice in somewhat haphazard and unsystematic fashion. Much of what he says is trite, and there is no documentation; at many points the information given is not too precise. Nonetheless there is a field for simple discussions of this sort which should remind the student and doctor that the practice of good medicine is not all measurement and mathematics. The reviewer found the book good reading.