Abstract
There is a great deal of disagreement in the literature as to the presence or absence of anaerobes in the fetid pus of suppurations from the lung. In 1893, Veillon examined the bacteriology of fetid pus and first pointed out the rôle of anaerobes in these cases. In 1898, Veillon and Zuber1 studied systematically the diseases characterized by gangrene; they isolated a number of anaerobic organisms and concluded that this process is elicited by them. This was confirmed by Hallé,2 Rist3 and Cottet.4 Guillemot5 later applied the technic of Veillon and Zuber in the study of pus from pulmonary suppurations. He found Bacillus ramosus in eight of thirteen cases, B. fragilis in six, Micrococcus foetidus in three, B. thetoides in three, B. fusiformis in two and Staphylococcus parvulus in one. He ascribed to B. ramosus an important rôle in the pathogenicity of abscess of the

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