198 BACTERIOLOGY 



CLASS XV. WITH ENDOSPORES. AEROBIC AND FACULTATIVE 

 ANAEROBIC. RODS SWOLLEN AT ONE END AT SPORULATION 

 OF THE TETANUS TYPE. 



I. Gelatin liquefied. 



212. Bact. gracile (Zimm.) 



B. gracilis Zimmerman : Bact. Nutz. u. Trinkwasser, 1890. 



Morphology. Bacilli 0.8 : 2.4-3.6 /a — threads. 



Gelatin colonies. Deep : entire, becoming ameboid — reticulated. Surface : 



thin and spreading. 

 Gelatin stab. In depth, growth beaded ; on the surface, after some weeks a 



liquefaction of the surface. 

 Agar slant. Growth thin, bluish white. 

 Potato. Growth scanty. 

 Habitat. Water. 



II. Gelatin not liquefied. 



213. Bact. canis 



B. des Hundestaupe Bruno-Galli : Centralblatt f. Bakteriol., XIX, 1896, 694. 



Morphology. Bacilli 0.3:1.2-2.5/*, often dumb-bell-shaped. Stained by- 

 Gram's method. 



Gelatin stab. In 24 hours, gas bubbles in depth; on the surface, growth 

 punctiform, white, waxy, becoming large and sinking into the gelatin, 

 producing a sh;aIlow funnel without apparent liquefaction. 



Agar slant. Growth of small, white points, becoming white disks with 

 undulate borders. 



Potato. Growth whitish, translucent. 



Milk. Not coagulated. Indol negative. 



Lactose bouillon. No gas. 



Habitat. Urine, exudate, etc., of dogs. 



CLASS XVL WITH ENDOSPORES. OBLIGATE ANAEROBIC. 

 I. Rods not swollen at sporulation, malignant oedema type. 



214. Bact. anaerobicum (Sternberg) 



B. anaerobicus-liquefaciens Sternberg : Manual, 1892, 693. 



Morphology. Bacilli 0.6 : 2-3 /j, ; filaments. 

 Gelatin colonies. White, granular. 

 Pathogenesis. Doubtful. 

 Habitat. Intestines of yellow fever cadavers. 



