NON-PATHOGENIC BACILLI. 649 



masses; at the end of two or three days the oval, white, superficial colonies 

 are seen with the naked eve to be surrounded with these outgrowths, whicli 

 resemble the feet and antennae of certain insects. In gelatin stick cultures 

 a white layer is developed upon the surface which gives off short, isolated 

 outgrowths. Upon potato a smooth, dirty-yellow layer of limited extent is 

 developed. 



311. BACILLUS CYSTIFORMIS (Clado). 



Found in the urine of a patient with cystitis. 



Morphology. Very short and slender bacilli. 



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

 Grows slowly at the room temperature. Upon gelatin plates forms trans- 

 parent, yellowish colonies, first round and later oval in form; from the 

 fourth to the seventh day a granular elevation appears at the centre, 

 around which a finely granular, yellowish zone is seen, and outside of this 

 a broad, transparent zone with double contour. In gelatin stick cultures a 

 scanty development occurs along the line of puncture, and on the surface a 

 whitish layer is developed. Upon agar a yellowish- white layer. 



312. BACILLUS HEPATICUS FORTUITUS (Sternberg). 



Obtained, by inoculation in a guinea-pig, from the liver of a yellow-fever 

 cadaver. 



Morphology. Resembles Bacillus coli communis in its morphology, but 

 differs from this bacillus in being strictly aerobic. 



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

 Does not form spores. Grows at the room temperature in the usual culture 

 media. Upon gelatin plates the deep colonies are spherical, homogeneous 

 or finely granular, and light-brown in color; at the end of four days they 

 are more or less lobate. The superficial colonies are sbaped like a mamma, 

 with striatious radiating from the centre, and are of a dark -brown color 

 under the microscope. In gelatin stick cultures no growth occurs along the 

 line of puncture, except to a slight extent near tbe surface; on the surface 

 a white, button-like mass is formed about the point of puncture. Upon the 

 surface of glycerin-agar the development is quite rapid at 35 C., the entire 

 surface being nearly covered with a soft, milk-white growth within twenty- 

 four hours. Upon potato, at the end of forty-eight hours, a rather dry and 

 thick, cream-white growth forms along the line of inoculation ; the potato 

 has a bluish discoloration, which subsequently disappears ; at the end of two 

 weeks a rather thin, semi-fluid, light-brown layer covers the entire surface. 

 Not pathogenic for rabbits single experiment. 



313. BACILLUS INTESTIXUS MOTILIS (Sternberg). 



Obtained from the contents of the intestine of yellow-fever cadavers. 

 ^Morphology. Resembles Bacillus coli communis in its morphology, but 

 differs from this bacillus in being very actively motile, in its colonies upon 

 gelatin plates, etc. 



Biological Characters. An aerobic and facultative anaerobic, non- 

 liquefying, actively motile bacillus. Spore formation not observed. Grows 

 in the usual culture media at the room temperature. Upon gelatin plates, 

 at the end of twenty-four hours, the deep colonies are spherical, homogene- 

 ous, and of a pale-straw color; the superficial colonies resemble little drops 

 of water and are of a pale-brown color by transmitted light. In gelatin 

 stick cultures pale straw-colored colonies are developed all along the line 

 of puncture, and a rather thin, translucent, whitish layer forms upon the 

 surface; sometimes a nebulous outgrowth occurs from the line of puncture, 

 and tufted outlying colonies are formed throughout the gelatin; at other 

 times, in old cultures, a few feathery tufts sprout out from the line of punc- 



