Fig. 18. 



Section through a lobule of the lung in pneumonic plague of a guinea- 

 pig. Most of infundibula and alveoli are filled with exudation ; in the 

 centre several vessels filled with plague bacilli — dark in figure. x 85. 



Fig. 19. 



The exudation in one of the infundibula of previous figure more highly 

 magnified ( x 1000), showing that the exudation is practically a continuous 

 mass of B. pestis. x 1000. 



