636 LABORATORY EXERCISES 



III. PHYSICAL AND BIOCHEMIC FEATURES 



' I » 



I ' CO 



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I. Fermentation Tubes Containing Peptone S a 



Water or Sugar-fkeb Bouillon, and '-go 



; Q to 



I 's 



S jo |S I 



Gas production in per cent. (Fig. 226) . 



Fig. 226. — Graduated fennentation tubes for gas determinations. {Schneider, 

 Pharmaceutical Bacteriology, p. 60.) 



2. Ammonia Production.— /?eeWe, moderate, strong, absent, masked by acids. 



3. NiTKATES IN Nitrate Broth. — Reduced, not reduced. 



Presence of nitrites ammonia 



Presence of nitrates free nitrogen 



4. Indol Production. — Feeble, moderate, strong. 



5. Toleration of Acids. — Great, medium, slight, acids tested 



6. Toleration of NaOH. — Great, medium, slight. 



7. Optimum Reaction for Growth in Bouillon, stated in Terms of 

 Fuller's Scale. 



