摘要：

Contributions to the study of the pneumonia following influenza in the recent epidemic are still desirable because of the difference of opinion as to its nature and causes that has been evidenced by numerous published papers. All have agreed as to the uniform character of the disease influenza wherever it has appeared in its swing across the continent, but conflicting views have been presented as to its etiology and as to the relation of various bacteria discovered in the respiratory tract, especially in cases of pneumonia, to the original disease and to the pneumonia. The dispute is concerned more particularly with the part played by the Bacillus inflenzae of Pfeiffer, which some authors have found so regularly present as to lead them to consider it the cause not only of the pneumonia but also of the original epidemic disease influenza. Indeed, it was launched by Pfeiffer as the cause of

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