THE CLASSIFICATION OF BACTERIA 65, 



19. Str. mirabilis Roscoe-Lunt 



Phil. Trans. Roy. Soc., London, CLXXXIII, 1892, 648. 



Morphology. Cocci forming very long chains ; elements 0.4 /A. 



Gelatin colonies. Deep colonies: in 4 days, minute, gnarled-convoluted thread- 

 like masses. Surface colonies: faint transparent expansions, 2 mm. 

 Microscopically, masses of fine long threads, filamentous. 



Gelatin stab. On the surface a thin transparent film, 3-5 mm. 



Agar slant. Like growth on gelatin. 



Potato. Growth inappreciable. 



Bouillon. A fine sediment like masses of threads of cotton wool. Grow in 

 an atmosphere of hydrogen. 



Habitat. Isolated from sewage. 



20. Str. conglomerates Kurth 



Trans, gth International Med. Congress, Berlin, 1891, 335. 



Morphology. Cocci in chains as conglomerate masses. Differs from Str. 

 pyogenes in that in bouillon cultures at 37 C. there form at the bottom of 

 the tube smooth, round, very firm white scales, or a single white layer, 

 which is not disintegrated when the tube is slightly agitated. 



Pathogenesis . Very pathogenic for mice. 



Habitat. Associated with scarlet fever ; etiological relation undetermined. 



21. Str. acidi-lactici (Marpmann) 



Sphcerococcus acidi-lactici Marpmann : Erganzungshefte des Centralblatt f. allgemeine 

 Gesundheitspflege, II, 121. 



Morphology. Cocci very small ; oval, in pairs or short chains. 



Gelatin colonies. Porcelain-white, the size of a pin's head. 



Gelatin stab. In depth but slight growth ; surface growth elevated, white, 



with dentate margins, becoming in 6 weeks light yellow. 

 Milk. Becomes reddish, coagulated, acid. 

 Habitat. Fresh cow's milk. 



22. Str. erysipelatos Fehleisen 



Str. erysipelatos Fehleisen : Aetiol des Erysipels, Berlin, 1883. 



Str. pyogenes Rosenbach : Mikroorganismen bei den Wundinfectionskrankheiten des- 



Menschen, Wiesbaden, 1884. 

 Str. puerper alls Arloing: Recherches sur les Septicemies, 1884. 



Morphology. Cocci about i.o /u,. Chains best seen in bouillon cultures. 

 Stain by Gram's method. Optimum temperature 37 C. 

 F 



