62 BACTERIOLOGY 



15. Str. lactis (Sternberg) 



Microcoecus lactis-viscosus Sternberg : Manual of Bacteriology, 1892. 

 Micrococcus of bitter milk Conn: Centralblatt f. Bakteriologie, IX, 1891, No. 20. 



Morphology. Cocci medium-sized, frequently in pairs. In agar colonies form 



short chains. Growth at 35 C. 

 Gelatin colonies. Small, round, becoming liquefied and spreading ; also thin 



granular. 

 Gelatin stab. A shallow crateriform liquefaction ; liquefaction progresses 



rapidly ; liquefied gelatin viscous. 

 Agar slant. A glistening white growth. 

 Potato. Glistening white discrete masses. 



Bouillon. Good growth ; a thin film on surface ; the medium becomes viscous. 

 Milk. Rendered bitter. In 24 hours, at 37 C., coagulated ; acid, peptonized ; 



butyric acid produced. 

 Habitat. Isolated from cream which had a bitter taste. 



CLASS III. NON-CHROMOGENIC. GROW AT ROOM TEMPERATURES. 

 GELATIN NOT LIQUEFIED 



I. Streptococci, at least in the animal body, with a capsule. 



PNEUMOCOCCUS GROUP. 



A. Elements frequently elongated. 



1 6. Str. pneumonia; (Weichselbaum) Gamaleia. 



B. Elements spherical. 



17. Str. Weichselbaumii (Trev.) L-. and N. 

 II. Streptococci without a capsule. 



A. Cocci actively motile. 



1 8. Str. sanguinis Pitfield. 



B. Cocci non-motile. 



i . Aerobic and facultative anaerobic. 



a. Gelatin colonies floccose-filamentous. 



19. Str. mirabilis Roscoe-Lunt. 



b. Gelatin colonies not as above specified. 



* In bouillon, elements in conglomerate masses, arranged in 

 chains ; free chains uncommon. 



20. Str. conglomeratus Kurth. 

 ** Streptococci in free chains. 



t But little growth in the depth of the gelatin, aerobic. 



21. Str. acidi-lactici (Marpmann). 



