THE CLASSIFICATION OF BACTERIA 193 



Gelatin colonies. Deep: in 14 hours, 0.2 mm., white-gray, filamentous. 

 Surface: in 14 hours, 1 mm., crateriform, entire, circular; border ciliate, 

 becoming in 24 hours 3 mm. in diameter. 



Agar slant. Growth thin, dirty white, frosted ; agar stained brown. 



Gelatin stab. In depth, slight growth, rarely ciliate ; liquefaction crateri- 

 form, becoming funnel-formed. 



Potato. Growth dry, white, smooth, glistening, becoming in 2 weeks pinkish. 



Bouillon. Turbid, with a crumpled pellicle. 



Litmus milk. Coagulated, decolorized, alkaline. 



Glucose bouillon. No gas. Indol negative. Grow at 36 . 



Habitat. Soil. 



197. Bact. gangliforme (Ravenel) 



B.gangliformis Ravenel : I.e., 34. 



Morphology. Bacilli straight rods, rounded ; length 5-6 times their breadth ; 

 in chains. 



Gelatin colonies. Deep: arborescent. Surface: margins well defined, 

 bordered by a corona of fine spear points ; in liquefied gelatin the fila- 

 mentous habit resembles the potato bacillus ; in 2 days, a thick myco- 

 derma on the surface, with lacework of bars radially placed on margins. 



Agar slant. Growth dirty white, dry, with fern-like edges, becoming 

 wrinkled. 



Gelatin stab. In 24 hours, surface growth 3 mm., liquefaction crateriform, 

 becoming in 4 days a funnel, becoming stratiform ; a pellicle on the 

 surface. 



Potato. Growth dry, crumpled, becoming dirty white, moist, slimy. 



Bouillon. Turbid, with a mycoderma. 



Litmus milk. Rendered acid ; coagulated in flocculi ; in 2 weeks, alkaline. 



Glucose bouillon. No gas. Grow at 36 . 



Habitat. Soil. 



198. Bact. vermiculare (Frankland) 



B. vermicularts Frankland : Zeitsch. f. Hygiene, VI, 1889, 384. 



Morphology. Bacilli 1.0: 2-3 ft filaments ; spores in chains. 



Gelatin colonies. Deep: irregular. Surface: thin, flat, irregular; margins 



of wavy bundles; centre rough, wrinkled. 

 Gelatin stab. In depth, a slight growth; on the surface growth glistening, 



gray ; after some time liquefaction commences below the surface of the 



colony. 

 Agar slant. Growth smooth, glistening, gray. 



