248 BACTERIOLOGY 



Milk. Coagulated. Nitrates reduced. 



Agar slant. Growth thin, translucent. Lactose litmus red, becoming blue. 



Habitat. Isolated from silk larvaj of Clisiocampa fragilis. 



118. B. dendriticus Lustig 



Diag. Bale, des Wassers, 1893, 99. 



Morphology. Bacilli 0.5-0.8 : 0.8-2.0 /a. 



Gelatin colonies. Large, raised, white, moist, glistening, with 8-10 branches; 



liquefied very slowly. 

 Gelatin stab. In depth, growth white, beaded ; on the surface, a semispherical 



bead. 

 Agar slant. Growth a thin, iridescent layer. 



Bouillon. A membrane adhering strongly to the walls of the tube. 

 Potato. Growth white, moist. 

 Habitat. Water. 



-CLASS VI. WITH ENDOSPORES. AEROBIC AND FACULTATIVE ANAE- 

 ROBIC. COLONIES ON GELATIN PLATES BECOMING AMEBOID, 

 ETC. GELATIN NOT LIQUEFIED. 



I. Little tendency to grow in the depth of the gelatin, especially in gelatin 

 stab cultures. 



119. B. Zopfi (Kurth). 



120. B. Zenkeri (Hauser). 



II. Decided growth along the entire length of the needle in gelatin stab 

 cultures. 



A. Growth on potato very slow and scanty, light, becoming yellowish, 



never brownish. 



121. B. arbor escens Ravenel. 



B. Potato growth brownish, abundant ; strongly pathogenic for mice and 



rabbits. 

 1 2. B. letalis (Babes). 



119. B. Zopfi (Kurth) 



Bact. Zopfi Kurth : Ber. d. Deutsch. Bot. Gesellschaft, February, 1883. 



Morphology. Bacilli like B. mirabilis. 



Gelatin colonies. Colonies generally grow just beneath the surface, as branch- 

 ing zoogloea, radiate and filamentous forms. 



