284 BACTERIOLOGY 



215. B. punctiformis 



B. No. 2j Conn : I.e., 1893, 53. 

 Morphology. Bacilli plump rods, 0.8 : 1.5 p, in twos, no chains. Facultative 



anaerobic. Grow at 35 . 

 Gelatin colonies. Small round transparent beads, 0.5 mm. ; in 5 days 1 mm., 



small, white, glistening. 

 Gelatin stab. Surface growth thin, rough, somewhat transparent. 

 Agar slant. Growth white, somewhat elevated, spreading. 

 Potato. Growth moist, white, glistening, elevated, becoming brownish. 

 Milk. Not coagulated, thickens to a pasty mass, becoming brownish, acid. 

 Bouillon. Turbid, with a sediment ; no pellicle. 

 Habitat. Milk. 



217. B. siccus 



B. No. 2$ Conn : l.c, 53. 

 Morphology. Bacilli 0.7 : 2.0 /1; no chains. Facultative anaerobic. Grow at 



36. 

 Gelatin colonies. Small, round, with concentric wrinkles, becoming 1 mm., 



with a central nucleus and a darker rim, separated by a partly clear space ; 



the edge may be rough or lobed. 

 Gelatin stab. Surface growth thin, spreading, transparent, dry, white. 

 Agar slant. Growth white, somewhat elevated. 

 Potato. Growth grayish, dry, elevated, yellowish brown. 

 Milk. Slightly alkaline. 

 Bouillon. Turbid, with a pellicle. 

 Habitat. Milk. 



218. B. ginglymus Ravenel 



I.e. 37- 



Morphology. Bacilli straight, 3-7 times their breadth ; occur singly and in 

 chains of 2-3 elements ; ends rounded. 



Gelatin colonies. Deep colonies : yellowish, granular, 0.5 mm. Surface colo- 

 nies: in 24 hours, minute, white, punctiform, gray, granular ; edges irregu- 

 lar ; in 36 hours 0.25 mm., white ; centre orange-brown, marmorated with 

 an outer gray zone ; do not exceed 0.5 mm. In 7 days a colorless border, 

 finely veined, with a brown centre. 



Agar slant. A grayish white line, moist, glistening, 1 mm. wide. 



Gelatin slab. In depth, 10 days, indistinct globular outgrowths; on the sur- 

 face a grayish button, 2-3 mm. 



Potato. Growth thin, spreading, yellowish, moist, glistening, becoming 

 brownish. 



