47° 



Pneumonia 



The spleen is enlarged, firm, and red-brown. The blood with which 

 the cavities of the heart are filled is firmly coagulated, and, like that 

 in other organs of the body, contains large numbers of the bacteria, 

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

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

 oculation be made by a hypodermic needle plunged through the 

 chest-waU into the pulmonary tissue, pneumonia rarely results. 

 Gamaleia* reported that pneumonic consolidation of the lungs of 



Fig. 169. — ^Lung of a child, showing the appearance of the organ in the stage 

 of red hepatization of croupous pneumonia. The pneumonia has been preceded 

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

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

 prominent appearance of the bronchioles through the lung. 



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

 coccus 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. 



* "Ann. de I'Inst. Pasteur," 18 

 t Ibid., 1890, III, 285. 



, II, 44°- 



