In a study of the treatment of pneumonia it will be well at the outset to remind ourselves of the meaning of the term. Not all writers and not all clinicians mean by pneumonia merely the blood infection which localizes its lesions in the lung in the form of lobar or fibrinous pneumonia. A few remember the fact that there are many types of infection other than that of the pneumococcus capable of producing the picture of lobar pneumonia. Still fewer recall the ever-increasing frequency of what we may term, for sake of accuracy of description, bronchocatarrhal pneumonia. The very few who do indeed make these discriminations avoid speaking of the "treatment of pneumonia," and are never found including under the one term conditions as different as darkness from light.
Without dwelling on the fact that either fibrinous or bronchocatarrhal pneumonia may be caused by any one or more than