18 
SHELLFISH CONTAMINATION FROM SEWAGE-POLLUTED WATERS. 
TABLE 3.—Results of the bacteriological examination of sea water over oyster beds—Cont’d- 
COLLECTED FROM LOCALITIES SHOWING PROBABLE POLLUTION. 
Surface water. Deep water. | 
| 
Bacteria | _ |B.enteri-|| Bacteria B. enteri- 
pee eubie | B. col tidisspo-|| per cubic | B.coli | tidisspo- 
centimeter per cubic} rogenes || centimeter | percubic| rogenes 
Sample number. (plainagar| centi- | percubic||(plainagar| centi- per cubic 
four days | meter. centi- fourdays | meter. centi- 
at 25° C.) meter. || at 25°C.). meter. 
5 ee es er re el GRA a a 50 | 1 0 40 1 0 
ER Mag ts eet ON ee I es 60 | 1 0 60 1 0 
eA ts Se ieee A IER Sg Se 10, 000 1 1 2, 600 10 0 
Be, Tce Raho e Cae eae 7,000 1 1 4,000 1 10 
Boe See oes a eaene See 2,000 1 10 2,000 it 10 
Goth ae a 2 eee 600 0 1 4,000 1 1 
eS oes 400 0 0 200 1 1 
eee BO Sea Deen ee 300 0 1 100 1 1 
Qe IR Soe ae Tes eee Ae 2,300 0 1 5900 | 1 1 
Approximate average. ...-- 2,500 0.6 Ney 1,500 | 2 De 7 
These results, as a whole, indicate 
that in this case the deep water 
was more polluted as regards B. colt and B. enteritidis sporogenes than 
the surface water over the same locality. 
TaBLE 4.—Bacteriological examination of water collected over a distance of about 200 
miles, a portion of which covers extensive shellfish grounds. 
OVER OYSTER BEDS. 
Salt. 
Remarks. 
(September, 1909.) 
Per cent. 
Bacteria per cubic 
centimeter (plain , 
Bennie ager incubated Bee peel 
number.| 2!™e- Pare ayS) centi- 
meter. 
fe Dee SYP: 
PioM. 
1 eects 7.30 400 50 1 
De Be aA 8.00 200 100 0 
See 8.30 150 40 0 
As no * 9. 00 100 30 0 
GES Soe 9. 30 90 40 0 
Glee se 10. 00 S00 200 0 
(Sater 10. 30 150 90 0 
Sixes 11.00 150 20 0 
Qiex4 11.30 1 50 0 
10S. Se. 12.00 100 40 0 
A.M. 
it] Beep ses 12. 30 90 40 ) 
IVR 1.00 60 60 0 
1S ees 1.30 100 40 0 
12 eee 2. 00 50 30 aB 
UG eee 2.30 30 50 0 
LOR 3. 00 400 100 i 
UPPER LIMIT OF OYSTER 
| 5 (Ee 3.30 50 30 aB 
feel Rees 4.00 40 1090 0 
p10. 4.30 400 200 1 
202 5. 00 50 40 1 
Hissiea ses se 5. 30 200 100 10 
PA dee ET 6. 00 500 150 1 
Pons ae 6. 30 10, 000 8, 000 100 
Dae ee 7.30 160, 000 90, 000 1,000 
t 
a Bubble. 
Near boat landing. 
Out in channel. 
No gas in 1 ce. 
Gas in 10 cc, none in 5ce. 
No gas in 10 ce. 
Gas in 10 cc, none in 5cc. 
Gas in 10 ce. 
Gas in 5 ce. 
BEDS. 
Gas in 5 ec, bubble in 1ce. 
Gas in 5 ce. 
Bubble in 0.1 ce. 
Bubble in-0.1 ce. 
About 30 miles below city.. 
About 20 miles below city. 
Near landing below city. 
Landing near sewer. 
= em te re ll 
