THE CLASSIFICATION OF BACTERIA 331 



Bouillon. Slight turbidity,, with a flocculent sediment. 



Agar slant. Growth dirty white, finely granular. Non-pathogenic. 



Habitat. Isolated from the tongue. 



2. Spirosoma nasale (Weibel) Migula 



Vibrio nasalis Weibel : l.c 

 Mpnta. nasale Migula: l.c. 



Morphology . Bacilli from the nasal mucus as thick vibrios ; in bouillon 



cultures as straight rods ; on agar as spirals. 

 Gelatin colonies. Small, entire, yellowish brown, finely granular ; gelatin not 



liquefied. 

 Potato. No growth. No odor in cultures. Non-pathogenic. 

 Habitat. Isolated from nasal mucus. 



3. Spirosoma flavescens (Weibel) 



Vibrio flavescens Weibel : l.c. 



Morphology. Bacilli 1.5 times as thick as cholera bacteria, comma and S forms, 

 longer and shorter forms ; tendency to form long spirals not evident. 



Gelatin colonies. Deep : ovoid, granular. Surface : round, entire, dirty 

 grayish yellow. 



Gelatin stab. Surface growth flat, with lobular edges, not depressed. 



Agar slant. Growth dull yellow, with grayish spots. 



Potato. Growth thick, pasty, dull yellow. 



Bouillon. Turbid ; no pellicle. 



Habitat. Sewer mud. 



4. Spirosoma flava (Weibel) 



Vibrio Jlavus Weibel : l.c. 



Morphology. Bacilli like the preceding. 



Gelatin colonies . Deep: golden yellow, finely granular. Surface: light yel- 

 low, mottled, with a white zoned border. 

 Agar slant. An ochre-yellow layer. 

 Bouillon. Turbid ; no pellicle. 

 Habitat. Sewer mud. 



5. Spirosoma aurea (Weibel) : l.c. 

 Morphology. Bacilli as in No. 3. 

 Gelatin colonies. Deep : ovoid, granular ; centre golden yellow, with a lighter 



border. Surface: round, entire, granular, golden yellow, with a lighter 



border. 



