SEWAGE CONTAMINATION OF OYSTER BEDS. 225 
Taste XITI.—Analysis of oysters from the Nayatt beds--Continued. 
1 
| . ice | err ar 
| Red colo- | 
A a Dextrose, nies on lit- / Other feeal 
‘ > c fz) » s bi = 
Specimens and date of collection. Wrarsremt adel mariasiace B | Actaris 
= tose agar. 
. coli. 
Oysters, October 1h. | 
o JINIGNITIN ES So pecusence on Sdao > SoBe COCOOOOSE OR SORSrrancrsc 
PEITIUCSTING 2 <.c.2 oo.<1<.5- ee aaa ais Teale Sissi aiwicinicc'e ore 
MTL CSTIUN Creme sre ale tararsr nae wicleloe aleewiaaa( Scjscisiv Siciste ce S 
MEU LCSUIN Crepe ee ere cen mcaseioe acces aasacccMesceccses 
MMLC ESIN Cuan seis oars Scicis oe views aie em Rls Soe w ce eicicteielawieleleiete 
MBIUNUCS TIN Cre cyoe = Meisiaee eleiaisiso ciewis sic micwicwiee ca'ewcc aeesieee 
Pe Rectunn e.ce ee. Bae Bary Bid hey Peay Ralais ois fee siseAideted seis 
RUPEE GC UUITIN ore roicroteratate aialayote <(oinseis wis slarwisiein oars. cie cicusjc sie e(steislave 
++ 
NH Oop 
ce le eed Wars 
P)+l+1++ 
We ae 1 
MBINUGEStIN OE ctasetnassiekteieci- ce noc cwtsesescchccecemencee 
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+14!4 
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MMBLTNCES UIT Ose seine reer oieic arse ae aioe Gini isinne wise Sicicioiaintc stays: 
MMU SGUTN Cleats = 852 ee lea Ste eas clayateaveyafeiavatay= alo (ete ret Sy Jerdie.Ssi 
INGE SUI Caer mee la ere ernee eae cai ccanjsrierei ics icia ae atomiois 
+++) 44114 
(SESE ea 
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These results show a still further decrease in the infection. About 
23 per cent of the specimens examined contained 2. col7. It is possi- 
ble, however, to demonstrate the presence of sewage bacteria in oysters 
living from 5 to 6 miles distant from the sewer outfall. 
Passing now from the western side of the river below Conimicut 
Point, a number of samples—four batches, making 32 oysters in all— 
were taken from the’ Rocky Point oyster ground. Two batches were 
obtained from the beds off Bayside, and two from the beds off War- 
wick Neck, below Rocky Point. No one of the tubes inoculated with 
material from the intestines of these specimens gave reactions for 
B. coli, This organism was, however, found in the juice of a single 
oyster from the Bayside beds. The stomachs of 10 of the specimens 
were examined, but . coli was not found in any of these analyses. 
These lots were taken from the river at a distance of 6 and 7} miles, 
respectively, from the Fields Point sewer outfall. 
Oysters from the Warren River grounds, on the other hand, were 
more or less contaminated by sewage. Table XIV gives the results 
of the analyses of 8 oysters dredged off the mouth of this river. 
F. C. 1904—15 
