SEWAGE CONTAMINATION OF OYSTER BEDS. 



223 



Table XI. — Analyms of oysters from the Bulloch Neck oyster heels. 



gpecimens and date of collection. 



Oysters, October 17, 1901 



1. Juice 



2. Juice 



3. Juice 



4. Juice 



5. Juice 



1. Intestine , 



2. Inte.stine 



3. Intestine 



4. Intestine 



5. Intestine 



Oi/stCiS. October ;?5. 



1. Juice 



2. Juice 



3. Juice 



4. Juice 



5. Juice 



1. Intestine 



2. Intestine 



3. Intestine 



4. Intestine 



5. Inteetine 



Oi/^tcrs, October SO. 



1. Juice 



2. Juice 



3. Juice 



4. Juice 



5. Juice 



1. Intestine 



2. Intestine 



3. Intestine 



4. Intestine 



5. Intestine 



Dextrose 

 fermented. 



Red colo- 

 nies on lit- 

 mus lac- 

 tose agar. 



(") 

 («) 

 («) 

 (") 

 («) 

 C) 

 (") 

 («) 



B. coH. 



Other fecal 

 bacteria. 



" Not made. 



U. colt' was found in a very large number of oysters, clams, and 

 mussels taken above Bullock Neck, while onl}' 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 nearly all the .shellfish from Fields Point 

 and Pawtuxet contained Ij. 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 bed, 4 miles below the main sewer outlet, contained the colon 

 bacillus. 



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

 shore of Conimicut Point, which, as already stated, is 5^ miles below 

 Fields Point and is planted in from 6 to 18 feet of water. Twent}"- 

 iive oj^sters from this bed were opened and examined, with the follow- 

 ing results (p. 221), cultures being taken from the intestines only of 

 these specimens. 



