3 o8 BACTERIOLOGY 



2. Ps. monadiformis (Kruse) 



B. coli-mobilis Messea: Riv. d'igiene, Roma, 1890. 



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



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



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 canuni). 



