THE CLASSIFICATION OF BACTERIA 271 



Milk. Coagulated, peptonized, alkaline. 



Glucose and saccharose bouillon. Gas. No gas in lactose bouillon. 



Habitat.. Cheese. 



173. B. vulgatus Trevisan. 



B. mesentericus-vulgatus Fliigge: Die Mikroorganismen, 1886. 



. ,, B. Kw/^a/aj, "iTevjsan : Genera, 1889, ig. 



Potato bacillus of various authors. 



Morphology. Bacilli 0.8:1.6-5.0 jn; somewhat shorter and smaller than 

 B. subtilis. Stain by Gram's method. 



Gelatin colonies. Without radiations lilte B. subtilis. Surface colonies : round, 

 becoming crateriform, with a grayish white, delicate, crumpled membrane. 

 Microscopically, in early stage, border of colony segmented. 



Gelatin stab. In depth, a narrow tube ; on the surface, a crateriform to strati- 

 form liquefaction, with a surface membrane. 



Agar slant. Growth gray white, glistening, becoming crumpled. 



Bouillon. , Weakly turbid;- a membrane which is firm and not easily broken 

 by shaking. ^ 



Milk. Co3gulated slowly, alkaline, slimy, peptonized. 



Potato. Growth thin, white, crumpled, becoming light yellowish. Indol 

 negative. H2S production feeble. , 



Habitat. Widely distributed. 



174. B. lactis No. 2 Fliigge 



Zeitsch. f. Hygiene, XVII, 1894, 272. 



From descriptions, not differentiated from the preceding. 

 Habitat. Milk. 



175. B. peptonans Sterling 



B. lactis-peptonam Sterling: Centralblatt f. Bakteriol., 2ie Abt., I, 1895, 473. 

 From descriptions, not differentiated from 173. 



176. B. megatherium var. Ravenelii 



B. megatherium Ravenel : I.e., 11. 



Morphology. . Bacilli thick, rounded, 3-5 times their breadth ; occur in chains, 

 in which rods are bent on each other ; lengths unequal. Motility slight, 

 ameboid. 



