THE CLASSIFICATION OF BACTERIA 24 1 



Agar slant. Growth glistening, translucent. 

 Potato. Growth thick, irregular, flesh-colored. 

 Habitat. Isolated from the air. 



B. No. 9 Pansini, from sputum, and B. pneumonkus-agilis Fliigge, indistinct 

 from the preceding. Comp. B. vermicularis Frankland. 



98. B. radiatus 



B. aerogenes-meningitidis Centanni : Archiv per le Scienze Mediche, XVII, 1893, 1. 



Morphology. Bacilli 0.3 : 2-2.5 Z 1 5 seldom in filaments. 



Gelatin colonies. Daisy-shaped, rosulate. 



Gelatin stab. Liquefaction slow, with gas. 



Agar slant. Growth porcelain-white. 



Bouillon. Turbid. 



Potato. Growth grayish yellow, uneven, rough. 



Pathogenesis. Subdural inoculations of rabbits cause death in a few hours to 

 days or weeks, with progressive palsy, emaciations, and lung complica- 

 tions, hyperemia of meninges, etc. 



Habitat. Isolated from two cases of meningitis. 



99. B. recticularis Jordan 



Report Mass. Board of Health, 1890, 834. 



Morphology. Bacilli long, rather slender, ends slightly rounded, 1 : 5 /i ; may 

 occur in chains of 8-10 individuals. In many bacilli there are large 

 vacuoles, with strongly refracting edges. Grow better at 37 than at 



2I-23. 



Gelatin colonies. Deep colonies send out long spiral filaments, which under 

 a low magnification look like so many jellyfish with streaming tentacles. 

 The surface colonies at first form irregular expansions. The gelatin is 

 liquefied so slowly that the liquid evaporates almost as soon as formed. 

 The colonies then resemble slight hollows or cups in the gelatin, which 

 show an irregular, reticulated structure. 



Gelatin stab. The surface growth as in gelatin plates. Filamentous out- 

 growths from the line of stab. 



Agar stab. Surface growth dry, dull, convex ; a poor growth in depth. 



Potato. In 2 days, growth white, dull, dry. In 5 days, growth of a character- 

 istic woolly appearance. 



Milk. Coagulated in 1 5-20 days at room temperatures, acid. 

 I 



