This little volume comes as part of an irregularly appearing monograph series on immunology, allergy and the infectious diseases. Under "atypical" pneumonia the author reviews German roentgenologic literature on the pulmonary shadows frequently mistaken for tuberculous infiltration. He observed seventy cases located in various parts of the lung fields; only twenty-three cases involved the apexes. In thirty-two cases with lesions the shadows disappeared in two months. The clinical course and radiology of these cases and their relation to grip and to tuberculosis is discussed. He erroneously accepts the finding of tubercle bacilli as a decisive criterion in excluding pneumonia. The newer American work on radiography of the chest and the bacteriology of pneumonias has been entirely overlooked. Readers of current American medical journals will find no new point of view.