634 



LABORATORY EXERCISES 



4,5 



I'orm of growth, filiform, ccliinulalc, beaded, spreading, plumose, arbores- 



eenl, rhisoid (Fig- 225). 



Klevalion of growth, flat, e-ffuse, raised, convex. 



Luster, glistening, dull, crelaecous. 



Topography, smooth, cotUoured, riigosc, vcrrucose. 



Optic characters, opaque, translucent, opalescent, iridescent. 



Chromogenesis, 



Odor, absent, decided, resembling 



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



Medium, grayed, brovmed, reddened, blued, greened. 



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



in days. 



Agak 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 coli); 2. echinulate 

 (Bacterium acidi laclici); 3, beaded (Streptococcus pyogenes); 4. effuse (B. vuigaris); 

 5. arborescent (Bacillus mycoides). (From McFarUind. after Frost in Schneider, 

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



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

 Liquefaction, crateriform, napiform, infundibuliform, 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 agHatioH, 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 



