86 



GENERAL BACTERIOLOGY 



1. Line of puncture : filiform, uniform growth without any spe- 

 cial characters (Fig. 23, 1) ; nodose, consisting of closely aggregated 

 colonies; beaded, loosely placed or disjointed colonies (Fig. 23, 2) ; 

 papillate, covered with papillae; echinulate, minutely prickly (Fig. 

 23, 3) ; villous, beset with undivided hair-like extensions (Fig. 23, 

 4) ; plumose, a delicate feathery growth; arborescent, beset with 

 branched hair-like extensions (Fig. 23, 5). 



2. Surface growth. Same as for plate cultures. 



B 



FIG. 23. Types of Growth in Stab Cultures. A, Non-liquefying: 1, Filiform (B. coli); 

 2. Beaded (Str. pyogenes); 3, Echinate (Bact. acidi-lactici) ; 4, Villous (Bact. murisepti- 

 cum); 5, Arborescent (B. mycoides). B, Liquefying: 6, Crateriform (B. vulgais, 24 

 hours); 7, Napiform (B. subtilis, 48 hours); 8, Infundibuliform (B. prodigiosus); 9, Sac- 

 cate (Msp. Finkleri): 10, Stratiform (Ps. fluorescens). 



II. Liquefying. 



1. Shape of liquefied area: crateriform, saucer shaped (Fig. 

 23, 6) ; napiform, outline of a turnip (Fig. 23,7) ; infundibuliform, 

 shape of a funnel, conical (Fig. 23, 8) ; saccate, shape of an elon- 

 gated sac (Fig. 23, 9) ; stratiform, liquefaction extending to the 

 walls of the tube and then downward horizontally (Fig. 23, 10). 



2. Condition of fluid : See Bouillon below. 



STREAK CULTURES (Gelatin, Agar, Potato or Blood serum). 



1. Form: filiform (Fig. 24, 1) ; nodose; beaded (Fig. 24, 3) ; 



