55 



the five remaining " wet " oysters had been transferred it 

 yielded 50 B. coli eommunis per 1 c.c. 



Oyster 4, " dry " having been kept two days dry, yielded 7970 



B. coli eommunis. 



5, " wet " having been two days in (twice) changed 

 sterile sea water and fresh tub, yielded 1305 

 B. coli eommunis. 



The sea water, which contained the remaining four wet 

 oysters, was analysed after three changes ; it yielded B coli 

 eommunis per T % c.c. 



Oyster 6, " dry " kept three days dry, yielded 5790 B. coli 



eommunis. 

 7, " wet " kept three days in (thrice) changed sterile sea 



water, yielded 216 B. coli eommunis. 



8, " dry " kept four days dry, yielded 2625 B. coli corn- 

 munis. 

 9, "wet" kept four days in (four times) changed sterile 



sea water, yielded 1 1 B. coli eommunis. 

 11, " wet" kept seven days in (five times) changed sterile 



sea water, yielded 18 B. coli eommunis. 

 13, "wet" kept eight days in (six times) changed sea 



water, contained no B. coli eommunis per f 



part of oyster. 



Summarising the above results in tabular form, we 

 have : 



TABLE VII. 



SEA WATER INFECTED WITH NORMAL FAECAL MATTER. 

 SEA WATER. 



Immediately after infection . . 230,000 B coli per 1 c.c. 



After 24 hours 177,000 



1 day change .... 650 



2 days' .... 50 



3 .... per T V c.c. 



