摘要：

A frequent and striking characteristic of serofibrinous pleural exudates is the fact that they are very rapidly formed in large amounts. This characteristic is particularly evident in those infections of the respiratory tract, due to hemolytic streptococci, in which both the pleura and the lung are very edematous. In the recent epidemics of streptococcal bronchopneumonia this was so striking that often within a day or two following the onset of the illness an exudate of more than 1,000 c.c. would be found in one of the pleural cavities. In seeking an explanation, it seemed probable that the respiratory movements were important factors. The line of reasoning which suggested itself was somewhat like this: The presence of a negative pressure in the pleural cavity might tend by aspiration to draw fluid from a pleural surface which was edematous. Since the intrapleural pressure diminishes still more as the inspiration becomes deeper, one . . .

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