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1)Since Loeffler's syndrome was first described in 1932, a large number of cases have been reported in the foreign literature and a small number in the English-American literature. Whether all of the reported cases are true instances of the syndrome is open to decided doubt.2)The syndrome is best described as a transitory, migratory pulmonary infiltration, demonstrable by roentgenologic examination and associated with eosinophilia, which may be very marked. The severity of the roentgenologic findings is in surprising contrast to the physical examination, which is frequently entirely negative, and to the minor symptomatology and mild clinical course.3)The pathogenesis is still undetermined, but the disease is now generally believed to develop on an allergic background, and intestinal parasitism has been identified as the causative agent in the few cases in which any identification at all has been possible.4)Diagnosis rests upon the radiologic picture, the transience of the roentgenologic findings, and the degree of eosinophilia. It cannot be made upon a single film. Pulmonary tuberculosis is the most frequent differential diagnostic consideration, and for therapeutic reasons the differentiation is extremely important. Therapy is directed toward the allergic disease, Loeffler's syndrome, in itself seldom requiring treatment.5)An additional case of Loeffler's syndrome is herewith added to the American literature of the subject.

Bronchoscopy has advanced far beyond the original indication for its use, the removal of foreign bodies from the bronchi, and is now recognized as a procedure that is, in experienced hands, neither difficult nor dangerous. In such conditions as atelectasis, bronchiectasis, bronchial stenosis, asthma, lung abscess, malignancy, unexplained hemoptysis and tuberculosis, bronchoscopy serves a definite purpose both in diagnosis and treatment. The specific functions of the bronchoscope in the management of these diseases are discussed. In the suppurative diseases its purpose of aspiration is stressed, keeping in mind that an obstructed bronchus might be the causative factor of the suppuration. In neoplastic disease its function is the early establishment of the diagnosis in order that the lung may be resected before metastases develop.