NOT DESCRIBED IX PREVIOUS SECTIONS. 505 



thin, moist, and transparent in appearance; later they have a grayish color, 

 a coarsely granular surface, and are made up of flap-like layers. In gelatin 

 stick cultures the superficial growth consists of broad, grayish layers, and a 

 grayish-yellow growth is seen along the line of puncture, made up of crowded 

 colonies. Upon agar plates, at the end of twenty-four hours at 37 C., 

 thin colonies are developed, which have a granular surface, a smooth, more 

 or less irregular outline, and a pale-brown color in the centre. Upon potato 

 a scanty, moist, white layer develops along the line of inoculation. Upon 

 blood serum, at 37 C. , at the end of twenty-four hours a moist, shining layer 

 about four millimetres broad is developed along the impf strich ; this is gra- 

 nular at the margins, and later more or less fissured. 



Pathogenesis. Subcutaneous injection produces in dogs, rabbits, guinea- 

 pigs, and white mice a purulent inflammation in the vicinity of the point of 

 inoculation. 



132. BACILLUS SEPTICUS VESIOE. 



Obtained by Clado (1887) from the urine of a person suffering from cys- 

 titis. 



Morphology. Bacilli with round ends, 1 6 to 2 ji long and 0.5 jn thick; 

 never united in pairs or chains. 



Stains with the usual aniline colors and also by Gram's method. 



Biological Characters. An aerobic and facultative anaerobic, non- 

 liquefying, motile bacillus. Forms spores. Grows in the usual culture 

 media at the room temperature. Upon gelatin plates small, spherical or 

 oval colonies are developed throughout the gelatin, which rarely exceed the 

 size of a pin's head ; these are transparent, and yellowish-white in color ; 

 under a low power the centre is seen to be dark gray and is surrounded by a 

 well-defined marginal zone of a pale-yellow color. In gelatin stick cultures 

 the growth along the line of puncture is first seen as a delicate, whitish 

 thread ; at the end of six or seven days it is made up of lenticular colonies, 

 one-third as large as a pin's head, arranged in two lines like piles of coin. 

 Upon the surface the growth is scanty and consists of a thin layer around the 

 point of inoculation, which has a jagged contour. Upon the surface of agar 

 development is slow and forms a grayish- white stripe along the impf strich. 

 Upon potato a flat, dry, chestnut-brown layer is formed. 



Pathogenesis. Pathogenic for rabbits, guinea-pigs, and mice. Death 

 appears to result from the toxic products formed, as well as from the multi- 

 plication of the bacilli in the inoculated animals. 



133. BACILLUS OF GESSNER.' 



Synonym. Bacterium tholoideum (Gessner). 



Obtained by Gessner from the contents of the intestine of healthy persons. 

 Resembles in its morphology and in its growth in culture media Bacillus 

 lactis aerogenes of Escherich. 



Pathogenic for mice and for guinea-pigs. 



134. BACILLUS CHROMO-AROMATICUS. 



Obtained by Galtier (1888) from a pig which died from a general infec- 

 tious malady characterized by broncho-pneumonia, pleuritis, enteritis, and 

 swelling of the lymphatic glands. 



Morphology. -Bacilli of medium size with rounded ends. 



Stains with the usual aniline colors. 



Biological Characters. An aerobic and facultative anaerobic, liquefy- 

 ing, motile bacillus. Not observed to form spores. Grows in the usual cul- 

 ture media at the room temperature better in the incubating oven. The 

 cultures all produce a green or brown pigment and have an aromatic odor. 

 In gelatin stick cultures a yellowish-white layer is formed upon the surface 

 of the liquefied gelatin, which has a bright-green color ; a yellowish-white 



