SPUTUM SEPTICEMIA 385 



hard, dark red, and dry; or it may be soft and rich in blood. 

 Frequently there is a limited fibrinous exudation over por- 

 tions of the peritoneum. 



Except in the exudations, the organisms are found only 

 in the lumen of the bloodvessels, where they are usually 

 present in enormous numbers. In the blood they are prac- 

 tically always free, being but rarely found within the bodies 

 of leukocytes. 



Fig. 75 



Bacterium piieumonise in blood of rabbit. Stained by method of Gram. 

 Decolorization not complete. 



In stained preparations from the blood and exudates a 

 capsule is not infrequently seen surrounding the organisms. 

 (Fig. 75.) This, however, is not constant. 



If a drop of blood from the dead animal be introduced 

 into the tissues of a second animal (mouse or rabbit), iden- 

 tically the same conditions will be reproduced. 



If the organism be isolated in pure culture from the blood 

 of the animal, and a portion of this culture be introduced 

 into the tissues of a susceptible animal, we shall see again 

 the same pathological picture. 

 25 



