SEWAGE CONTAMINATION OF OYSTER BEDS. 



223 



Table XI. — Analysis of oysters from tJie Bulloch Neck oyster beds. 



specimens ami date of collection. 



Oi/sters, October 17, 1901 



1. Juice 



2. Juice 



3. Juice 



4. Juice 



5. Juice 



1. Intestine , 



2. Intestine 



3. Intestine 



4. Intestine 



6. Intestine 



Oi/stcrs. October 23. 



1. Juice 



2. Juice 



3. Juice 



4. Juice 



5. Juice 



1. Intestine 



2. Intestine 



3. Intestine 



4. Intestine 



5. Intestine 



Oysters:, October SO. 



1. Juice 



2. Juice 



3. Juice 



4. Juice 



5. Juice 



1. Intestine 



2. Intestine 



3. Intestine 



4. Intestine 



5. Intestine 



Other fecal 

 bacteria. 



a Not made. 



B. coll was found in a very large number of oj^sters, clams, and 

 mussels taken above Bullock Neck, while only 8 of the 15 specimens 

 taken from this (Bullock Point) bed were found to be infected. The 

 organism was occasionally found in the juice of oysters whose intestines 

 did not contain it. While nearlv all the shellfish from Fields Point 

 and Pawtuxet contained B. coll and other fecal bacteria, and while 70 

 per cent of the oysters from the Sabins Point bed were found to be 

 infected, about 53 per cent of the specimens taken from the Bullock 

 Point licd, 4 miles below the main sewer outlet, contained the colon 

 bacillus. 



The next lot of oysters was obtained from the Ijed off the northern 

 shore of Conimicut Point, which, as alrcad}' stated, is 5^ miles below 

 Fields Point and is planted in from 6 to 18 feet of water. Twentj'^- 

 five oysters from this bed were opened and examined, with the follow- 

 ing results (p. 224), cultures being taken from the intestines only of 

 these specimens. 



