16 



The present report deals almost exclusively with the 

 Bacteriology of the oyster and the behaviour of the 

 Bacillus typhosus in sea-water and in the body of the 

 oyster. The subject of the green colouration in oysters 

 is also discussed but will be treated more fully in a 

 subsequent report. The questions investigated are the 

 following : — 



I. The indentification and differentiation of Bacillus 

 typhosus and B. coll communis. 

 The action of sea-water upon the growth of B. 



typhosus. 

 The Bacteria present in the ahmentary canal of 



the oyster. 

 The infection of the oyster with B. typhosus, and 



its removal by washing. 

 The green colouration and green disease in oysters. 



II. 



HI. 



IV 



V. 



I. — The Identification and Differentiation of Bacillus 



typhosus and B. coli communis. 

 "We have systematically tested the majority of the chief 

 differential reactions upon samples of Bacillus typhosus 

 and B. coli obtained from numerous sources, and have in 

 all cases found unmistakable differences between the two 

 bacilli. 



Table showing Differences of Beaction. 



