Medical bacteriology.—By John A. Roddy, M.D., Associate in Hygiene and Bacteriology Jefferson Medical College; Chief Assistant, Department of Clinical Medicine, Jeffersofi Hospital; Professor of Hygiene and Bacteriology, Philadelphia College of Pharmacy; Sometime Serologist to the Philadelphia General Hospital; First Lieutenant, Medical Section 0. R. C., U. S. A. Published by P. Blakiston's Son & Company, 1012 Walnut Street, Philadelphia. Price $2.50