XI] BACILLI : SPECIFICALLY PATHOGENIC 225 



produced are not essentially different from those of bacillus 

 coli ; they also form gas-bubbles in gelatine shake culture, 

 curdle milk, and produce indol in broth. The appearances of 

 the growth on Agar and on potato are the same as those of the 

 bacillus coli. As to flagella, they possess two or three flagella, 

 and taken from recent culture many individuals show active 



Fig. 77. — Film Specimen of the Juice of a Bubo in Oriental Plague; 



BESIDES A FEW NUCLEI THE FiLM CONTAINS THE BACILLUS OF PlAGUE IN 



Pure Culture. 



X lODO. 



locomotion. Morphologically they occur as short ovals, 

 singly and in dumb-bells, or as cylindrical individuals with 

 tendency to form chains. As stated just now, the chief 

 difference lies in the fact that, whereas bacillus coli injected 

 subcutaneously into guinea-pigs and mice in small doses 

 causes transitory local swelling only, and in large doses 



Q 



