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 hyperasmic ; spleen not enlarged ; 

 cocci in the blood. Rabbits and mice immune. 

 Habitat. Isolated from sputum in influenza. 



CLASS 11. NON-CHROMOGENIC. GROW AT ROOM TEMPEELATURES. 

 GELATIN LIQUEFIED 



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



6. Sir. Brightii Trevisan. 



II. Grow rather poorly in nutrient gelatin. 



7. Str. enteritidis Escherich. 



8. Str. Bonvicini. 



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. 



1 1 . 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. lactis Sternberg. 



6. Str. Brightii Trevisan 



streptococcus iei Morbus Brightii, Mannaberg : Centralblatt f. BakterioIogiCj V, l88g, 93. 

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



Morphology. Cocci 0.9/11; 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. 



