054 NON-PATHOGENIC BACILLI. 



324. BACILLUS PUTRIFICUS COLI (Bienstock). 



Found in human faeces. 



Morphology. Slender bacilli, about 3 ju long, often shorter, frequently- 

 united in long filaments. 



Biological Characters. An aerobic and facultative anaerobic, non- 

 liquefying, actively motile bacillus. Forms large spherical end spores, 

 which give the bacilli the form of a drumstick; the motile, spore bearing 

 rods always advance with the spore in front. Grows at the room tempera- 

 ture. Upon nutrient gelatin a layer having a pearly lustre is developed ; 

 later this has a yellowish color and is homogeneous in appearance. This 

 bacillus was supposed by Bienstock to be constantly present in faeces, and to 

 be especially concerned in the decomposition of albuminous substances. Its 

 characters of growth have not been determined with precision. 



325. BACILLUS SUBTILIS SIMULANS NO I. (Bienstock). 



Found in human fasces. 



Morphology. Bacilli with round ends, resembling Bacillus subtilis ; 

 grows out into long filaments, which become segmented and form short 

 chains of two to five elements; or, more commonly, separate into single 

 rods. 



Biological Characters. An aerobic, non-liquefying, non-motile bacillus. 

 Grows best at 37 to 39 C. Forms oval spores, in which germination oc- 

 curs at the two poles simultaneously, leaving the central portion of the new- 

 formed bacillus bulging from the presence of the spore membrane. Upon 

 nutrient agar this bacillus grows out in the form of a mesentery, yellowish- 

 white ' ' veins " running in all directions, which are united with each other 

 smaller anastomosing branches. 



326. BACILLUS SUBTILIS SIMULANS NO. II. (Bienstock). 



Found in human faeces. 



Morphology. The same as the preceding species. 



Biological Character s. An aerobic, non-liquefying bacillus. Grows very 

 rapidly best at 37 to 39 C. Upon the surface of agar forms a glistening, 

 white layer, which is at first smooth and later has a somewhat uneven sur- 

 face, while the margins are surrounded by grape-like outgrowths. Imper- 

 fectly described. 



327. BACILLUS STRIATUS ALBUS (Von Besser). 



Found in nasal mucus from healthy individuals. 



Morphology. Small, thick bacilli, of about the size of the diphtheria bacil- 

 lus ; often more or less curved ; in preparations stained with methylene blue 

 the bacilli have a striped appearance; club-shaped involution forms may be 

 seen. 



Biological Characters. An aerobic, non-liquefying bacillus. Spore 

 formation not observed. Grows at the room temperature in the usual cul- 

 ture media. Upon gelatin plates forms small, dry, superficial colonies. 

 Upon agar plates forms prominent, milk-white colonies, one-half centime- 

 tre in diameter, which under the microscope have a brown nucleus sur- 

 rounded by a paler brown marginal zone. Upon the surface of agar forms 

 a flat, shining, grayish-white layer. Upon potato a scanty, transparent,, 

 jelly-like layer. 



328. BACILLUS STOLON ATUS (Adametz). 



Found in water. 



Morphology. Bacilli two and one half times as long as thick. 



