636 LABORATORY EXERCISES 



III. PHYSICAL AND BIOCHEMIC FEATURES 



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

 Pharmaceutical Bacteriology, p. 60.) 



2. Ammonia Production.- — Feeble, moderate, strong, absent, masked by acids. 



3. Nitrates in Nitrate Broth. — Reduced, not redticed. 



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. 



