SEA-FISHEEIES LABOEATOEY. 



73 





B. 



B. coll. 



1. Institut Pasteur 



well marked 



marked pink 



marked 



growth abundant 



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Summary of Constancy or Variability of Eeactions. 



A. For B. typhosus : — 



1. Fermentation test. Constant (Burri and Stutzer 



have shown gas formation). 



2. Indol reaction. Slight indication in one case. 



3. Milk Coagulation. Slight clot in one case. 



4. Potassic iodide potato gelatine. Characteristic 



invariably, very little use as a separating medium. 



5. Potatoes. Constant with usual precautions. 



6. Beaction in gelatine. Marked differences of rate 



of diffusion. 



B. For B. coli :— 



1. Fermentation. Rate of gas formation variable, 



otherwise constant. 



2. Indol reaction. Reaction not constant. 



3. Milk coagulation. Rate variable. Constant with 



us, with others not constant. 



4. Potassic iodide potato gelatine. Abundant growth. 



5. Behaviour in gelatine. Diffusion very variable, 



in many cases less rapid than B. typhosus. 



6. Motility. Very variable. 



