22 



In the following series of experiments infected oysters 

 were taken, the duplicates of which as seen in the pre- 

 ceding table contained comparatively large nmnbers of 

 the B. typhosus, and were subjected to a running stream 

 of pure sea-water. The result is definite and uniform, 

 there is a great diminution or total disappearance of the 

 B. typhosus in from one to seven days. 



Table shoioing Organisms present after Washing. 



V. — The Green Colouration and " Green Disease" 

 in Oysters. 



We have continued our investigation of green oysters 

 from various localities, including both the healthy green 

 oysters grown at Marennes and other places on the West 

 and North coasts of France, and in the Eoach Eiver in 

 Essex, and also what we regard as the unhealthy oysters 

 which show a pale greenness due to a leucocytosis. The 

 green patches visible to the eye on the mantle of these 

 oysters correspond to accumulations of the leucocytes 



