450 Pneumonia 



most of which exhibit a lanceolate form and have distinct capsules. 

 The disease is thus shown to be a bacteremia unassociated with 

 conspicuous tissue changes. 



In such cases the lungs show no consolidation. Even if the in- 

 oculation be made by a hypodermic needle plunged through the 

 breast-wall into the pulmonary tissue, pneumonia rarely results. 

 Gamaieia* reported that pneumonic consolidation of the lungs of 



Fig. 170. — ^Lung of a child, showing the appearance of the organ in the stage 

 of red hepatization of croupous pneumonia. T?he pneumonia has been preceded' 

 by chronic pleuritis, which accounts for the thickened fibrous trabeculs extend- 

 ing into the tissue, and which may have had something to do with the peculiarly 

 prominent appearance of the bronchioles throughout the lung. 



dogs and sheep could be brought about by injecting the pneumococ- 

 cus through the chest-wall into the lung. Tchistowitschf stated 

 that by intratracheal injections of cultures into dogs he succeeded in 

 producing in 7 out of 19 experiments typical pneumonic lesions. 

 MontiJ claimed to have found that a characteristic croupous pneu- 



* "Ann. de I'Inst. Pasteur," 1888, 11, 440. 



t Ibid., 1890, ni, 285. 



t "Zeitschrift fiir Hygiene," etc., 1892, xi, 387. 



