238 BACTERIOLOGY. 



almost elliptical cells, often two to four linked 

 together. They form dark granular colonies, 

 which after twenty-four hours commence to liquefy 

 the gelatine ; a movement is then visible in the 

 centre of the colony, and an appearance of circum- 

 ferential rays results. They grow also on blood 

 serum, bouillon, and potatoes. Cultures injected 

 through the chest wall, or into the trachea, or ad- 

 ministered by inhalation, set up pneumonia. They 

 were isolated from pneumonic lungs of rabbit. 



Bacterium oxytocum perniciosum (Bacillus 

 oxytocus perniciosus, Wyssokowitsch). Short rods 

 with rounded ends, somewhat shorter and thicker 

 than the bacterium of sour- milk. They form 

 yellowish colonies, and in test-tubes develop a nail- 

 shaped growth. Cultivated in milk they produced 

 curdling, and an acid reaction. They were some- 

 times pathogenic in rabbits. Isolated from sour 

 milk. 



Bacterium cavicida (Bacillus cavicida, 

 Brieger). Very small rods, about twice as long 

 as broad. They form colonies in the form of 

 whitish concentric rings. On potatoes they 

 develop dirty yellow tufts. They are very fatal 

 to guinea-pigs. Isolated from human faeces. 



Bacterium coli commune, Escherich. Short, 

 slightly-curved rods, 1*5 //, in length, -3 -4 thick, 

 colonies yellowish and granular. They develop 

 a white scum on agar-agar and blood serum. 

 Fatal to guinea-pigs and rabbits, when inoculated 



