THE CLASSIFICATION OF BACTERIA 131 



Agar colonies. Deep-, round oval, brown, opaque, coarsely granular. Surface: 



Round, flatly convex, moist, glistening, milky white rather translucent; 



later round, thin, flat, slimy, translucent, 6 mm. Microscopically, light 



yellowish brown, homogeneous, finely granular; edge thin, indistinct. 



later grayish brown, grumose finely granular; border thin, entire 



undulate. 

 Gelatin slant. A thin, opaque streak ; edges finely erose. 

 Agar slant. A flat, white, opaque, moist, glistening, slimy stripe, about 3 



mm. wide. 

 Gelatin stab. Good growth in depth ; surface growth thin, flat 

 Bouillon (neutral). Turbid ; in 3 weeks clear, with easily diffusible sediment. 



No pellicle. 

 Potato. Growth thick, limited, moist, glistening, dirty white light dirty 



brown, becoming darker. 

 Milk. No change in consistency after 5 weeks, then coagulated on boiling. 

 Litmus milk. Rendered acid. 

 Blood serum. A narrow, moist, glistening, flat to raised, dirty white, slimy 



stripe. Indol negative. Nitrates reduced to nitrites. 

 Habitat. Isolated from garden soil. 

 Note. Under this head is placed : 



B. coli-immobilis (Kruse) 



Unbeweglicher FSces oder Kolonbacillus Germano-Maurea : Zeitsch. f. Hygiene, XII, 



1892, 498. 



B. coli-immobilis Kruse : Fliigge, Die Mikroorganismen, 1896, 339. 

 Indistinguishable from B. coli, except as to motility. 

 Habitat. Isolated from faeces. 



FRIEDLANDER BACILLUS GROUP 



25. Bact. pneumoniae Zopf 



Pneumococcal* Friedlander : Fortschritte Med.. 1883.715. 



Bact. pneumonite-crouposas Zopl : Spaltpilze, 1885, 66. 



Bacillus pneumonia Weichselbaum : Centralblati f. Bakteriologie. I, 1887, 589. 



Morphology. Bacilli 0.5-0.8 : 0.6-3.5 ft, with rounded ends; in animal body 

 with a capsule. Capsule only in milk cultures. 



Gelatin colonies. Deep : round oval, entire, brownish, opaque. Surface : 

 round, convex, white ; microscopically, round, entire, brownish yellow- 

 ish brown, opaque, with transparent borders. 



