58 BACTERIOLOGY 



Agar colonies. Small, grayish white, round, transparent ; becoming round 



grayish plaques. 

 Pathogenesis. Guinea pigs. One cc. of culture inoculated into pleural cavity is 



followed by death in 24 hours. Lungs hyperaemic ; spleen not enlarged ; 



cocci in the blood. Rabbits and mice immune. 

 Habitat. Isolated from sputum in influenza. 



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

 GELATIN LIQUEFIED 



I. Produce only a viscid softening of the gelatin after several weeks. 



6. Str. Brightii Trevisah. 



II. Grow rather poorly in nutrient gelatin. 



7. Str. enteritidis Escherich. 



8. Str. Bonvkini. 



9. Str. Fischeli. 



III. Grow well in nutrient gelatin, but slowly liquefy the medium. 

 10. St. carnis. 



IV. Grow well in gelatin at room temperatures, and rapidly liquefy the medium. 



A. Liquefaction of the gelatin takes place along the line of stab ; funnel- 



formed cylindrical. 



11. Str. coli Escherich. 



12. Str. septicus Babes. 



13. Str. liquefaciens Sternberg. 



B. Liquefaction of the gelatin takes place only on the surface ; shallow, 



crateriform. 



14. Str. albus Sternberg. 



15. Str. /act is Sternberg. 



6. Str. Brightii Trevisan 



Streptococcus bei Morbus Brightii, Mannaberg : Centralbiatt f. Bakteriologie, V, 1889, 93. 

 Str. Brightii, Trevisan: Saccardo, Syllog. Fungorum, VIII, 1057. 



Morphology. Cocci 0.9 p.; solitary pairs short chains of 6-10 elements. 

 Stain by Gram's method. 



Gelatin stab. A beaded growth along line of stab ; after 3-4 weeks a funnel 

 containing a very viscid gelatin, with brush-like outgrowths. 



Agar slant. Growth like Str. pyogenes. 



Potato. In 4-5 days at 37 C, white colonies, 0.5 mm., becoming a con- 

 fluent slimy growth. 



Milk. Coagulated, acid. 



