230 REPORT OF THE COMMISSIONER OF FISHERIES. 
The above results are condensed in the following table: 
Taste X VI.—Correlation of the results of water and shellfish analyses. 
see 
from the ee se || eee ai 
ee rae Denwidannal D- coli in| B. coli in| B.coli in | B. coli in 
Locality. peace nee water. | oysters. | clams. | mussels. 
let. 
Providence River: Miles. Per cent. | Per cent. | Per cent. | Per cent. 
TETAS POIMG oa ze iatelaelelaisvc erelaials arsisista’sjees sets jalesre 3-3 100 100 100 100 
PAW iG URC bene ape arate clot nciels cote ninco 2 100! ieemeeceee st 662 73 
Sabins*Rointtioystenibed! <2... ec - 2-1 eee 2 74 (Ul RepRReSAee InASae ccood 
BnllOckse oimtIOCG es hase sec ien eee een esse 1 59 DBs cde scot nal los eeeeeoee 
ConmimiecuiszRoinbionsas-eee sec eee sce ee ceoenes 5i 50 Sa Ils ac ceitats oe erate eee 
Na yattiBoimt 2 acjoc(c.. cos dcjsasiee saleejeele sis see se 5+ 31 De B= oa Sareey| Ree eee 
(Warren Rivier)): 20 csccccicmetncecwsc ce acceticelsmsecicinee cae 100 Git SO al he ene 
SAV SLO Ome rete cra ise ape tSiaie Sie ieiever erento teeter eistciovere ie ere ne 65 63 dl sctieis askie ment ewes 
VERA AKO CAN EO) ete, Great donuecsoagorbagsbosdadee 73 0 RatscecaddllssseSeus6c 
Narragansett Bay: | 
Bric enc ewislamd aaaccee secs ce niste nicer einieieretecoeiete 12 0 i Bapececadallsscccecenc 
WLCETOTGLS Rio rot ae sae rey) nee see crs jerome teeta sale oie 19 0 0 | 0 0 
Mount Hope Bay (Fall River sewer): j | 
KRACKER EL ro cj: rersioe cote cs islerersereltrsisie aie ore 4 0 Ouse: scces-tacpetemoaeee 
BTISTOMMORT ye ot - cine enwie eis teins seem neierrene 7 20 20) roe eel |e eee 
THE BACTERIOLOGY OF OYSTERS FROM UNPOLLUTED SOURCES. 
Before commencing the systematic examination of shellfish from 
different sections of the bay for sewage contamination an attempt was 
made to gain some knowledge of the bacterial content of oysters from 
sources known to be free from all sewage contamination. Inocula- 
tions were made from the juice, intestines, and stomachs of these 
specimens, nutrient gelatin, reaction 1.5-++, being used in this work. 
Plates were allowed to develop for two or three days at room tem- 
perature, and the colonies were fished out and studied in pure cul- 
ture. As many as possible of these cultures were identified, and a 
few which did not appear to be identical with species already described, 
yet were frequently found in the oysters examined, are described in 
this paper. For convenience I have prepared the accompanying chart, 
similar to one proposed by the American Public Health Association 
for use in the description of water bacteria, and have relied princi- 
pally upon the list of reactions given in this table for the description 
of these forms. Gelatin plate cultures were also made from water 
samples collected at the same places from which the oysters were 
obtained, in order to make a comparison between the bacterial content 
of the oyster and the water in which it lives. 
For this purpose oysters and water samples were collected at Kicke- 
muit River, Wickford Harbor, and the shores of Greenwich Bay. 
Twenty young native oysters growing on a mud flat left uncovered at 
low water were obtained from the last-named locality. Plates were 
inoculated with scrapings from the stomachs of 5 of these specimens 
and with samples of juice from 20. 
Of the 5 plates inoculated with material taken from the stomach, 3 
remained sterile and 2 developed but a few scattered colonies, which, 
. 
