226 REPORT OF THE COMMISSIONER OF FISHERIES. 
Taste XIV.—Analysis of oysters from Warren River. 
& 
Red colo- 
Dextrose, | nies on lit- | B 
fermented.| mus lae- 
| tose agar. | 
Other fecal 
. coli. = 
col bacteria. 
Specimens and date of collection. 
Oysters, October, 1902. 
UN UT CC rai- tas cic ie infec o'cikeeals Sea Ss essisinetadeeieemcecet) (6 MR Ra SARs Ti Spe ms ta poe ee 
WMG SSEMI OL. ~ iain ye a ieleS biaxe ote sles cissisicceaseiesisjatisem wretsies 
IMItCSUUING soiree mise nie mye Stree Siecicice oe eicle cine m cok cele 
RONTIGES GINO yey erates eet a cater ale erst ae ee aero rorots cee 
WALT ECS CMMIC: Ne) 5 2.2.1 a\o1/toversiereia cise e.c alcrsaiececisie Sloe ete marae ats | 
MULNIGCSUIMC A = Goa pee nee tis cenactte s eaiae erie neice icles mecemrete 
PP RIAUOSULING!: crac oo eee tee eee mee ne reer nye ie es ere 
PALOMA Inet ee fotak cee atese a nystarate lore ra oiaie rote avetsis mins reteciae 
MISLOMACH ojos uct coc b ales sae ee nae as ce ea cena! 
PBOCOING CLiaats cca seic clones een ele 2 ere ie cere emiaisietee sisi er == 27 ||. eee 
b++bt+]++++4++ 
| [tte] tttttt 
[+S] +++++ 1) ++++4++4+ 
aNo growth. 
The intestines of 5 of the 8 oysters examined contained PB. coli, 
which was also found in the juice of these 5 specimens. The stomachs 
of 3 were tested for colon forms, and two tests gave negative reactions; 
the tube inoculated from the third oyster remained sterile. 
The next lot of oysters examined was obtained from the beds situated 
under the lee of Pine Hill Point, Prudence Island. These beds are 12 
miles from Fields Point, out of the direct course of the river, which 
is continuous with the eastern passage of the bay, and are farther 
removed from any source of sewage pollution than are any other oyster 
beds in the river or bay. The intestines of 10 specimens from this 
bed did not contain colon forms. The juice and stomachs of 5 were 
found to be free from any sewage bacteria. . 
A more extended study was made of the oysters from Wickford 
Harbor, which, as has already been stated, is well down the western 
passage of the bay and far removed from sewage pollution. The water 
over these oyster beds has been analyzed a number of times, and P. colz 
has never been found. About 30 oysters were obtained from this 
locality in March and April, 1902, and examined by the fermentation- 
tube methods already described. No bacteria resembling organisms 
of the colon group were found in the intestines, though organisms fer- 
menting dextrose broth were occasionally observed. No growth devel- 
oped in 70 per cent of the tubes inoculated with the stomach content, 
and when growth occurred it was not due to the colon bacillus. The 
Juice of 8 of these oysters did not contain 2B. col7. 
In addition to the above series of fermentation tests for LB. colt on 
Wickford oysters, a second series, with a gelatin medium containing 
0.05 per cent carbolic acid, was carried out on another lot from this 
same locality. The intestinal content only of the oysters was subjected 
to analysis; no tests were made for the juice or stomach content. 
