G76 NON-PATHOGENIC BACILLI. 



liquefied gelatin a thin, whitish-gray, slightly wrinkled film is formed, and 

 below this it is densely clouded and of a yellowish color. Upon the surface 

 of agar a thin, smeary, yellowish layer is formed. Upon potato a fawn- 

 colored, transparent layer, which is sometimes slightly wrinkled ; later the 

 surface loses its transparency and becomes clouded. In milk coagulation 

 occurs and the precipitated casein is subsequently dissolved; the milk ac- 

 quires a bitter taste; produces butyric acid in milk. Bouillon cultures to 

 which sulphuric acid has been added give off an acid distillate which has the 

 odor of butyric acid. 



373. BACILLUS GASOFORMANS (Eisenbergj. 



Found in water. 



Morphology. Small bacilli. 



Biological Characters. An aerobic and facultative anaerobic, liquefy- 

 ing, actively motile bacillus. Spore formation not observed. Grows rap- 

 idly at the room temperature not in the incubating oven at 37 C. Upon 

 gelatin plates forms tolerably large, saucer-shaped cavities of liquefied gela- 

 tin, the contents of which are finely granular and may contain gas bubbles. 

 In gelatin stick cultures liquefaction rapidly occurs all along the line of 

 puncture and gas bubbles form in the non liquefied gelatin. 



374. BACILLUS CARABIFORMIS (Kaczynsky). 



Found in the stomach of dogs which had been fed exclusively on meat 

 for three days. 



Morphology. Short and slender bacilli. 



Biological Characters. An aerobic, liquefying actively motile bacillus. 

 Spore formation not observed. Grows rapidly at the room temperature. 

 Upon gelatin plates foi-ms small colonies, from the centre of which are given 

 off long processes with jagged outlines. In gelatin stick cultures liquefac- 

 tion occurs along the line of puncture, and the liquefied gelatin has a green- 

 ish-yellow color, while a whitish deposit accumulates at the bottom. Upon 

 the surface of agar a yellowish-white layer. 



375. BACILLUS GRAVEOLENS (Bordoni-Uffreduzzi). 



Found attached to scales of epidermis from between the toes of man. 



Morphology. Bacilli 0.8 long and of about the same breadth (micro- 

 cocci ?) 



Biological Characters. An aerobic, liquefying bacillus (?). Grows at 

 the room temperature. Cultures have a disagreeable odor. Upon gelatin 

 plates forms irregular, grayish-white spots which cause rapid liquefaction 

 of the gelatin and give off a disagreeable odor like that from the feet; later 

 the gelatin has a greenish-yellow color. Upon potato forms a grayish, stink- 

 ing layer. Liquefies blood serum. 



376. BACILLUS CAROTARUM (A. Koch). 



Obtained upon cooked carrots and sugar beets. 



Morphology. Bacilli from 0.97 to 1.05 /u long; grows out into long, flexi- 

 ble filaments resembles Bacillus brassicae. 



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

 Forms large oval spores. Grows best at 40 C. Upon gelatin plates forms 

 round, white colonies upon the surface, which under a low power appear to 

 be perforated with holes at the centre and are marked by fine lines. The 

 deep colonies in the liquefied gelatin are spherical, with a sharply defined, 

 smooth outline. In gelatin stick cultures a considerable growth occurs 

 upon the surface ; very scanty development along the line of puncture. 



