In a preliminary paper we have given the results of our experimental investigations on lobar pneumonia in dogs, briefly stating the experimental facts on which we have based the theory that lobar pneumonia must be considered as the pneumococcic variety in the large category of obstructive atelectasis of the lung.
In the present paper, we propose to develop this theory further and to show that a new light may be thrown on our knowledge concerning lobar pneumonia which may help to explain in a simple and clear way a great number of its features that have heretofore been inexplicable; furthermore, we shall show that pneumonia, up to now considered an exclusively medical disease, may be as much surgical as medical, and as such require an emergency treatment, necessitating a closer collaboration of the thoracic surgeon, the internist and the bronchoscopist.
We shall first develop our conception of lobar pneumonia and