308 BACTERIOLOGY 



2. Ps. monadiformis (Kruse) 



B. coh-mobihs Messea: Riv. d'igiene, Roma, 1890. 



B. monadiformis Kruse: Fliigge, Die Mikrourganismen, 1896, 374. 



Morphology. Bacilli short rods. Cultural characters like B. colt. 



Milk. Not coagulated, slightly acid. Gas in lactose, but none in saccharose 



bouillon. Non-pathogenic to mice. 

 Habitat. Isolated from typhoid stools. 



3. Ps. ambigua (Wright) 



B. ambiguus Wright: I.e., 439. 



Morphology . Bacilli small, ends rounded, occur singly, and in pairs and fila- 

 ments. A terminal flagellum. 



Gelatin colonies. Deep: round, entire, granular, brownish. Surface: in 3-4 

 days gray, translucent, slightly elevated, rather irregular, 2 mm., sharp. 

 Microscopically, granular, yellowish brown in the centre, with thin trans- 

 lucent margins, finely radiate. 



Agar slant. Growth gray, limited, sharply defined. 



Bouillon. Turbid; sediment; no pellicle. 



Potato. Growth thick, viscid, spreading ; gray creamy. 



Litmus milk. Acid, coagulated only after one month, and may not be then. 

 Grow at 36 . Indol positive. 



Pepton rosolic acid solution. Bleached. 



Habitat. Water. 



4. Ps. catarrhalis 



Der Bacillus der Hundestaupe Jess : Centralblatt f. Bakteriol., XXV, 1899, 541. 



Morphology. Bacilli 0.6:1.8-2.3, occur singly in cultures, in chains in the 

 animal body. Stain by Gram's method. A polar flagellum. 



Agar colonies. In 24 hours, at 37 , dark, entire, sharp, granular. 



Agar slant. In 24 hours, at 37 , growth abundant, soft, gray; border entire, 

 sharp; water of condensation turbid. 



Glycerin agar. A scanty growth of isolated colonies. 



Bouillon. Turbid, with a flocculent sediment. 



Potato. Growth white, velvety. 



Pathogenesis. The inoculation of pure cultures into dogs and cats produces a 

 pathological picture which the author considers identical with Hundes- 

 taupe. 



Habitat. Associated with Hundestaupe (Febris catarrhalis epizootica canum). 



