634 



LABORATORY EXERCISES 



Form of growth, filiform, cchinulatc, beaded, spreading, plumose, arbores- 

 cent, rhizoid (Fig. 225). 



Elevation of growth, jial, effuse, raised, convex. 



Luster, glistening, dull, cretaceous. 



Topography, smooth, contoured, rugose, verrucose. 



Optic characters, opaque, translucent, opalescent, iridescent. 



Chromogenesis, 



Odor, absent, decided, resembling 



.Consistency, slimy, butyrous, viscid, membranous, coriaceous, brittle. 



Medium, grayed, browned, reddened, blued, greened. 



Liquefaction (Loefifler's biood-serum) begins in days, complete 



in days. 



Agar Stab, Gelatin Stab. — Growth, uniform, best at top, best at bottom, 

 surface growth scanty, abundant; restricted, widespread. 



Fig. 225. — Types of streak culture, i, Filiform {Bacillus colt); 2, echinulate 

 (Bacterium acidi lactici); 3, beaded {Streptococcus pyogenes); 4, effuse {B. vulgaris); 

 5, arborescent {Bacillus mycoides). {From McFarland, after Frost in Schneider, 

 Albert: Bacteriological Methods in Food and Drug Laboratories, 1915: 89.) 



Line of puncture, filiform, beaded, papillate, villous, plumose, arborescent. 

 Liquefaction, crateriform, napiform, infundibidiform, saccate, stratiform, 



begins in days, complete in days. 



Medium, fluorescent, browned.] 



6. Nutrient Broth.- — Surface growth, ring, pellicle, flocculent, membranous, none. 

 Clouding, slight, moderate, strong; transient, persistent; none, fluid turbid. 

 Odor, absent, decided, resembling 



Sediment, compact, flocculent, granular, flaky, viscid on agitation, abundant, 

 scant. 



7. Milk. — Clearing, without coagulation. 

 Coagulation, prompt, delayed, absent. 



Extrusion of whey, begins in days. 



Coagulum, slowly peptonized, rapidly peptonized. 



Peptonization, begins on days, complete on days 



