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An enormous number of papers dealing with infectious diseases have appeared during the current year. Considerable progress has been made in the more common diseases, especially in pneumonia and influenza, and in a number of rarer diseases, such as encephalitis, tetanus and psittacosis. Many new features of academic interest have developed in the field of bacteriology, especially in regard to the classification of hemolytic streptococci and to certain of its biologic reactions and in the general field of microbic dissociation. Pneumonia. —The rational practice of regarding pneumonia from an etiologic point of view instead of from an anatomic one has gained much ground. The terms lobar pneumonia and bronchopneumonia are no longer considered satisfactory and must be qualified by terms indicating the causative organism. Even the restricted clinico-anatomic syndrome recognized as pneumococcic lobar pneumonia has been shown to be not a single disease but a group of specific infections, each