THE CLASSIFICATION OF BACTERIA 155 



Milk. In 5-10 days becomes thick, viscous; later, peptonized and clear; no 



special odor. 

 Habitat. Milk. 



88. Bact. sanguinis (Sternberg) 



B. sanguinis-typhi Sternberg : Manual of Bacteriology, 1892. 



Morphology. Bacilli typhi-Iike, 0.5-0.8 : 1.0-2.5 (* 



Agar colonies. Blue-gray, translucent, irregular, becoming dry. 



Potato. Growth invisible. 



Milk. Not coagulated. 



Pathogenesis. Slight or doubtful. 



Habitat. Isolated from blood of typhoid fever patients. 



CLASS IV. WITHOUT ENDOSPORES. AEROBIC AND FACULTATIVE 

 ANAEROBIC. WITHOUT PIGMENT. GROW AT ROOM TEMPERA- 

 TURES. GELATIN LIQUEFIED. 



I. Colonies on gelatin plates roundish, not amoeboid or proteus-like. 



Bact. ambiguum Group. 



A. Gelatin liquefied very slowly, or merely softened. 



1. Stained by Gram's method. 



89. B. Thuillieri (Trev.). Swine erysipelas; see Myco- 



bacterium. 



90. B. insidiosus Trevisan. Mouse septicaemia; see 



Mycobacterium. 



2. Decolorized by Gram's method. 



a. Pathogenic bacteria. 



91. B. mallei Zopf ; see Mycobacterium. 



92. Bact. salmonica (Kruse). 



b. Non-pathogenic. 



93. Bact. vermiculosum (Zimmerman). 



94. Bact. incannum (Pohl). 



95. Bact. trunwtum. 



B. Gelatin liquefied rather quickly. 



1. Stained by Gram's method. 



96. Bact. orchiticum (Kruse). 



97. Bact. pneumonicum Kruse. 



2. Not stained by Gram's method, or indeterminate. 

 a. Potato growth white, or color of the medium. 



* Potato growth dry, with irregular surface. Grow best at 37 C. 



98. Bact. varicosum (Sternberg). 



