NON-PATHOGENIC BACILLI. 651 



317. BACILLUS MARTINEZ (Sternberg). 



Obtained from the liver of a yellow-fever cadaver, kept for forty-eight 

 hours in an antiseptic wrapping. 



Morphology. A short, oval bacillus from 1 to 1.2/f long and from 0.5 

 to 0.8 n broad. 



Biological Characters. An aerobic and facultative anaerobic, non- 

 liquefying, non-motile bacillus. Does not form spores. Grows in the usual 

 culture media at the room temperature. Upon gelatin plates the deep colo- 

 nies are spherical and translucent ; superficial colonies shaped like a mam- 

 ma, with a central nipple-like projection, the surface covered with mosaic 

 markings. In gelatin stick cultures a thin, translucent, scanty growth upon 

 the surface, and large, spherical, translucent colonies along the line of 

 puncture. In glycerin-agar stick cultures growth to the bottom of the line 

 of puncture, and scanty development on the surface. 



318. BACILLUS EPIDERMIDIS (Bizzozero). 



Synonym. Leptothrix epidermidis. 



Found attached to scales of epidermis from between the toes. 



Morphology. Bacilli from 2.8 to 3 // long and 0.3 /* broad. 



Biological Characters. An aerobic, non liquefying bacillus. Forms 

 long, oval spores at 25 C. in three days. Grows best at a temperature of 15 

 to 20 C. Very scanty growth in gelatin. Grows upon the surface of agar. 

 Upon potato, at 15 to 20 C., the development at first is in the form of vis- 

 cid, transparent, drop-like colonies, which gradually coalesce and form a 

 rather thick layer. 



319. BACILLUS NODOSUS PARVus (Lustgarten). 



Found in the healthy urethra of man. 



Morphology. Bacilli from 1.2 to 2.4 n long and 0.4 /* broad; one ex- 

 tremity often presents an irregular club shape ; usually united in pairs, in 

 which the elements lie parallel or are united at an acute angle. 



Biological Characters. An aerobic and facultative anaerobic, non- 

 liquefying, non-motile bacillus. Grows best in the incubating oven. Spore 

 formation not observed. Very slow and scanty growth in nutrient gelatin. 

 Upon the surface of agar, at 37 C., at the end of twenty-four hours a white 

 line of growth is seen along the line of inoculation; at the end of two to 

 three days this has a breadth of five to six millimetres, and the central por- 

 tion of the layer is white, chalky in appearance, porous, and lustreless; 

 around this is a smooth, flat, glistening, grayish- white marginal zone one to 

 two millimetres broad. In agar stick cultures, at the end of five to eight 

 days, growth is seen along the line of puncture as a white stripe made up of 

 confluent spherical colonies, while at the point of puncture a small, stearin- 

 like drop is seen. 



320. BACILLUS HYACINTHI SEPTICUS (Heinz). 



Found in diseased hyacinths. 



Morphology. Bacilli with round ends, 4 to 6 n long and about 1 n broad ; 

 always solitary. 



Biological Characters. An aerobic and facultative anaerobic, non- 

 liquefying, motile bacillus. Spore formation not observed. Grows at the 

 room temperature. Old cultures have a sti'Oiig putrefactive odor. Upon 

 gelatin plates the superficial colonies are flat, shining, bluish-white in color 

 with a somewhat darker centre, transparent, and about two millimetres in 

 diameter; the deep colonies are oval with rather sharp poles, yellowish- 

 white, and lustreless. In gelatin stick cultures growth occurs all along the 



