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This book was prepared with three purposes in mind: first, to set forth the most recent scientific information concerning the transmissible diseases to the end that these diseases may be controlled or perhaps ultimately eradicated; second, to make the subject interesting, if possible, to the general reader, and to such persons and students as may need to study the subject, and, third, to emphasize the great advances that have already been made through scientific methods by comparing the past with the present. It is the author's firm conviction that the complete conquest of transmissible diseases waits as much on the intelligent appreciation of the facts by the laity as on the advances in research made by the medical profession. Confidence in the methods and motives of science is a most important asset to the people of the modern world, and in no field is its value more clearly demonstrated than