266 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). 



168. B. Madoxi (Miquel). 



2. Grow on ordinary culture media. 



a. Pepton rosolic acid solution decolorized. 



169. B.fissttratus Ravenel. 



b. Pepton rosolic acid solution not decolorized. 



* No growth on potato. 



170. B. alpha Dyar. 



** Growth on potato abundant, but nearly invisible. 



171. B. beta Dyar. 



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



1. Potato cultures becoming crumpled. Potato Bacillus Group. 

 a. Color of potato cultures whitish-yellowish. 



* Gelatin liquefied very rapidly. 



t 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. lad is No. 2 Fliigge. 



175. B. peptonan s Sterling. 

 Consistency of milk unchanged. 



176. B. megatherium var. Ravenelii. 



177. B. Scheurleni Sternberg. 



