1 88 BACTERIOLOGY 



II. Stab cultures in gelatin not distinctly arborescent. 



A. Gelatin colonies round, punctiform, not flat or spreading. 



1. Gelatin stab cultures show a saccate-funnel-formed liquefaction. 



a. Growth on potato yellowish. 



192. Bad. aerophilus (FlUgge). 



b. Growth on potato whitish. 



193. Bact. Trichoma (Trevisan). 



2. Gelatin stab cultures show a crateriform-napiforra liquefaction. 



194. Bad. Markusfeldii. 



B. Gelatin colonies flat or spreading. 



1. Margins of surface colonies floccose-ciliate fringed. 



a. Gelatin liquefied quickly. 



* Surface colonies, dense, felt-like, crimpled. 



195. Bad. crinatum (Wright). 

 ** Surface colonies not crimpled. 



f Agar and potato cultures smooth. 



196. Bact. verticillatum (Ravenel). 

 ft Agar and potato cultures crimpled. 



197. Bad. gangliforme (Ravenel). 



b. Gelatin liquefied slowly. 



198. Bact. vermiculare (Frankland). 



2. Gelatin colonies with irregular erose borders of the B. coli type. 



a. Agar smear cultures crimpled. 



* Milk rendered strongly acid, slimy. 



199. Bad. viscosum. 

 ** Milk rendered alkaline. 



200. Bact. rugosum. 



b. Agar smear cultures smooth, thin. 



201. Bad. granulosum (^nsstW). 



c. Agar smear cultures thick, wavy. 



202. Bact.filliforme (Tils.). 



3. Gelatin colonies streaming, oi 'Oat. proteus^ typ^- 



a. Milk rendered acid, gelatin rapidly liquefied. 



203. Bact. proteum. 



b. Milk rendered alkaline, gelatin slowly liquefied. 



204. Bact. truncaium. 



4. Gelatin colonies entire. 



205. Bact. turgidum. 



5. Gelatin colonies not definitely described. > 



206. Bad. geniculatum (Duclaux). 



207. Bact. pants. 



