65 



Oyster 6 (polluted lot) kept 1 day in clean water, contained 



100 B. coli communis. 

 7 (clean lot) kept 4 days in clean water, contained no 



B. coli communis. 

 8 (polluted lot) kept 2 days in clean water, contained 



no B. coli communis per T L part of body. 

 ,, 9 (clean lot) kept 5 days in clean water, contained no 



B. coli communis. 

 ,, 10 (polluted lot) kept 3 days in clean water, contained 



no B. coli communis. 



Tabulating the results of this experiment : 



TABLE X. 



Sea water infected with crude sewage from St. Bartholomew's 

 Hospital to the amount of 550 B. coli communis per 

 1 c.c. sea water (220,000 B. coli communia per 1 c.c. 

 crude sewage). 



CLEAN LOT. 



Oyster 1 after 1 day,* contained no B. coli communis. 

 3 ,, 2 days, 



K O 



" 11 5> 5) > 



7 4. 



>> 



POLLUTED LOT. 



Oyster 2 kept 1 day in polluted sea water, 800 B. coli communis. 

 4 2 days 150 



6 kept 1 day in clean sea water, 100 ,, ,, 



8 2 days per 



fa part of oyster. 



10 3 ,, ,, B. coli communis 



per -j^ part of oyster. 



Starting, then, with clean oysters and placing them in 

 sewage-polluted sea water polluted with sewage B. coli 

 communis to the amount of 550 per 1 c.c. we find that after 



* This will be understood as the time when the comparison between 

 the two lots commenced. 



