6(5 BACTERIOLOGY 



Gelatin colonies. Small, round, white, flat to slightly convex. Microscopically, 

 round, entire lobed laciniate, grayish-yellowish, punctiform finely 

 granular. 



Gelatin stab. Along stab filiform tuberculate ; on the surface as in plate 

 cultures. 



Agar colonies. As in gelatin. Microscopically round, translucent, grayish 

 yellow, punctiform granular. 



Agar slant. Minute grayish translucent colonies. 



Bouillon. Growth variable, turbid, becoming clear, with sediment. 



Milk. Coagulated. 



Potato. Growth invisible. Indol negative. H 2 S slight. 



Glucose bouillon. No gas, acid. 



Pathogenesis. Virulence variable. Inoculations of mice and rabbits cause 

 local suppuration, septicaemia, etc. ; bacilli in internal organs. 



Habitat. Associated with phlegmonous inflammation and suppurative pro- 

 cesses ; septicaemia, erysipelas, bronchopneumonia, puerperal sep- 

 ticaemia, angina, etc. 



VARIETIES. V. Lingelsheim, Zeitsch. Hygiene, X, 1891, 331, makes the two 

 following principal varieties of the species : 



1. Var. brevis. In bouillon form short chains, causing a turbidity of the 



medium. Growth on potato evident. Grow at a temperature of 

 io-i2 C. Generally non-virulent. 



2. Var. longus. In bouillon form long chains of 40 and more elements, the 



medium remaining clear, with a heavy slimy or flocculent sediment. 

 Growth on potato fails. Does not grow below 14-16 C. Generally 

 notably virulent. 



The following forms are also probably identical with one or more of the 

 varieties of Str. pyogenes : 



a. Str. cadaveris Sternberg: Manual of Bacteriology, 1892. 



b. Str. septicus Flligge : Die Mikroorganismen, 1886. 



c. Str. of Mannaberg: Centralblatt f. Klin. Med., 1888, No. 30. 



23. Str. enteritis var. Libmanii (See No. 2) 



Str. enteritis of Libman : Centralblatt f. Bakteriologie, XXII, 1887, 380 



L. isolated from cases of enteritis a streptococcus which he thinks identical 



with Str. enteritis Hirsh, with additional characters. 

 Morphology. Cocci 0.7-0.9 p. 



