42 



OYSTERS AND DISEASE. 



Table showing Differences of Reaction. 



Summary of Constancy or Variability of Reactions. 

 B. typhosus. — (i) Fermentation test; no 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. (5) Potato ; constant with usual 

 precautions. (6) Reaction in gelatine ; marked differences of rate of diffusion. 



