SEWAGE CONTAMINATION OF OYSTER BEDS. 991 
Bacillus colt and other sewage bacteria. In the above recorded 10 
oysters, B. coli was found without exception in tests made from the 
juice. In only one instance was it absent from the intestines, and 
when growth developed in tubes inoculated from the stomach content 
this organism was also recognized. The analysis of clams and mussels 
gave similar results. 2. cold was repeatedly found in the cultures. 
In addition, 2B. cloace, Bact. lactis-aerogenes and B. sporogenes were 
isolated from plates inoculated with material from both oysters and 
clams obtained from the neighborhood of Fields Point. 
The next specimens tested for B. cold were some clams and mussels 
from Pawtuxet Neck, 2 miles below Fields Point, taken on the beach 
which forms the northern shore of the neck where it juts out from the 
main shore line. The shore at this point was obviously contaminated, 
and only a few small clams were found alive, while the beach was 
strewn with heaps of the dead shells. Mussels also grew sparingly in 
the thatch near by. <A fresh set of young oysters was observed on the 
piles of the Rhode Island Yacht Club boathouse, but they were too 
small to be of use in this work. The results of the analysis of the few 
clams and mussels obtained from Pawtuxet Neck are found in Table IX. 
Taste IX.—Analysis of clams and inussels from Pawtuxet Neck. 
. Red OK Raita 
in em : iS : te ; extrose | nies on lit- aitae Other feea 
Specimens and date of collection. lrenmenteds ware EYEE B. coli. Beetern 
| tose agar. 
1 ) 
= a. 2 ere aa =a a = ae 
Clams, May 7. | 
PUL CCl soctc fers wins c slats sec atac see aince eeeeec cece + (a) } 
PUL CC raeetetolelate crs salen cia soso tee siete eile ayaycturs eizaia/urerefelere'e | + (a) “+ 
BPI COM mass a. oc leer ae ose ae Aches sem cbicienesinceace seeias + (a) -- 
lepEleGes Of VISCETALINASS ms <n oneness ne sos mee onc + (a) H + 
DRPRICCES/OfeVISCCLAL INAS ian ee ssc o aces sme caae eee 4 (a) | + 
SPRLE CES OL VAISCETAL ON ASS ais semis siecle iaim aalsial=mlaicinral=\=sel= + (a) = 
AMPIALC CES OlmvISCELA IN ASS oem em ease aa ecleae cesses | = (a) = 
PIC CESTOTaVIISCELA IN ASS mee esac eee iste aise lanrere ever | a a - 
GrePiecesiofavisceralemass|s. ccs. ce oie ces etcmicce cscs oS + — 
: Mussels, May 7. | 
GUE INALC Chere tole ojele a Yaieis oie mii stelle eects So otharsle cid aaiaieersitaniaie - (a) | fi  eaeccmeeeees 
PULL CR ie e cree ea ora a are oe Tote siesta ais n= Sc See cee nersislersere + (a) Spe VER fe Syaievareratste 
QUEL CO teaee cee Seine se noe sega oe neces nal woe ose eee ccs | + (@) + aye Ses ee 
He MEIECESIOL VAISCCLA) MASS la jas)-sare aciecl= <1 co a1 syne eleisiere's | + + Ae ee ibosoaact ation 
PEC CES OL VASCCTAMMMNASS oro saeric ics cies -inlemicciee eae { ao So of Racer coerce 
SPIECES O laviSCeralIN ASS: 7c sn5 seme ces sneccn ceese nek + + | ERE eas eeaec 
APIS CESOlpVISCCLAGIN ASS iam jane Sone naccemre careers + -- Se Saco cere 
| 
a Not made. 
Practically every specimen collected on the Pawtuxet shore con- 
tained B. coli. No other species of fecal bacteria were isolated. 
The Sabins Point oyster ground lies directly across the river from 
Pawtuxet, close to the eastern shore. In April and May, 1901, two 
batches! of oysters were dredged from this bed in from 6 to 12 feet 
of water on the east side of the ship channel, and inoculations were 
made from the juice, stomach, and intestines of these specimens. 
The results of the tests are given below: 
Fourteen of the twenty oysters taken from this bed, 2 miles below 
