GENERAL BACTERIOLOGY 



papillate; echinulate (Fig. 24, 2) ; effused (Fig. 24, 4) ; villous; 

 plumose; arborescent (Fig. 24, 5). 



FIG. 24. Types of Streak Cultures: 1, Filiform (B. coli); 2, Echinulate (Bact. acidi- 

 lactici); 3, Beaded (Str. pyogenes); 4, Effuse (B. vulgaris) ; 5, Arborescent (B.mycoides). 



2. Size ; in millimeters. 



3. Surface elevation. 



4. Topography of surface. 



5. Color. 



6. Consistency. 



7. Changes in medium. 



>- Same as plate cultures. 



BOUILLON CULTURES. 



1. Condition of fluid : clear; clouded, degree of, does or does not 

 clear on standing. 



2. Membrane: when formed; color; consistency; structure. 



3. Sediment : amount; color; character; whether compact or 

 flocculent; on agitation appears granular, flaky or viscid. 



4. Reaction. 



MILK CULTURES. 

 I. Curd formed: 



1. Time required to curdle. 



2. Character of curd: hard or soft 1 ; massed or in fragments; 

 changed or not on boiling. 



3. Whey : amount; transparent or turbid. 



4. Reaction : effect on litmus. 



5. Digestion: time required; solution complete or incomplete; 

 reaction; character of solution, clear, or cloudy. 



6. Gas bubbles. 



7. Odor. 



II. Digestion without formation of curd. 



III. No visible change even after boiling. 



