2 66 BACTERIOLOGY 



CLASS XV. WITH ENDOSPORES. AEROBIC AND FACULTATIVE 

 ANAEROBIC. RODS NOT SWOLLEN AT SPORULATION. GELA- 

 TIN LIQUEFIED. 



I. Gelatin stab cultures arborescent. 



164. B. Prausnitzii Trevisan. 



165. B. aureus Pansini. 

 II. Gelatin stab cultures not distinctly arborescent. 



A. Liquefaction of the gelatin begins only after 7 days. 



URO-BACILLUS GROUP. 



1. Grow in ordinary culture media only upon the addition of urea or 



by rendering media distinctly alkaline with NH 4 HO. 



166. B. Pasteuri (Miquel). 



167. B. Freudenreichii (Miquel). 



1 68. B. Madoxi (Miquel). 



2. Grow on ordinary culture media. 



a. Pepton rosolic acid solution decolorized. 



169. B.fissuratus Ravenel. 



b. Pepton rosolic acid solution not decolorized. 



* No growth on potato. 



170. B. alpha Dyar. 



tJ Growth on potato abundant, but nearly invisible. 



171. B. beta Dyar. 



B. Gelatin liquefied quickly, i.e. in less than 7 days. 



i. Potato cultures becoming crumpled. POTATO BACILLUS GROUP. 

 a. Color of potato cultures whitish-yellowish. 



* Gelatin liquefied very rapidly. 



| Agar smear cultures white-gray, not yellowish, wrinkled. 

 Gas generated in glucose bouillon. 



172. B. Pammelii. 



No gas generated in glucose bouillon. 



% Milk not coagulated, or at most only slimy ; 



peptonized. 

 9 Milk shows a slimy fermentation. 



173. B. vulgatus Trev. 



174. B. lactis No. 2 Fliigge. 



175. B. peptonans Sterling. 

 Consistency of milk unchanged. 



176. B. megatherium var. Ravenelii. 



177. B. Scheurleni Sternberg. 



