20
CONJEEVERAM.
WATER SAMPLES TAKEN—22ND FEBRUARY 1912.
REMARKS.—The river bed of the Vagavati was dry when samples were taken. The supply is
intermittent. There has been about 13.52 inches of rain since last analysis.
Bacteriological Analyses.
SAMPLE I.—TAP IN FRONT OF PUMPING STATION.
Number. L a c t o s e . S a c c h a r o s e .
D u l o t e . A d o n i t e . I n u l i n .
V o g e s a n d P r o s k . I n d o l . M o t i l i t y .
G r o u p .
Name of Bacilli.
Group and
Remarks.
Total colonies per cc. on agar at 37° C. cannot be counted.
Bile salt lactose, medium.
+
-
1 tube of 20 cc
...
...
...
1
No lactose fermenters.
2 tubes of 10 cc.
...
...
...
...
2
3 „ 5 cc.
...
...
. ..
. . .
3
3 „ 1 cc.
...
...
... ...
3
3 „
.1 cc. ... ... ...
...
3
3 „ .01 cc.
...
...
...
. . .
3
Fœcal bacilli not present in 60 cc.
No vibrios in 100 cc.
SAMPLE II.—TAP ADJOINING THE SERVICE RESERVOIR.
1. + + + + - + - III B. 67.
Total colonies per cc. on agar at 37° C.-19.
2 + + + + - + - - III Do.
...
... Group I, nil.
3 + + + + - + - - III
Do.
...
...
„ I I ,
n i l
.
4 + + + + - + - - III
Do.
...
...
„ I I I , 1 0 .
Bile salt lactose, medium.
+
_
5 + + + + - + - -
I I I
Do.
...
...
„ I V ,
n i l
.
6 + + + + - + - - III Do.
1 tube of 20 cc.
...
...
...
..
1
. . . 7 + + + + - + - - III Do.
8 + + + - + - + - -
I I I Do.
...
... Class I, nil.
2 tubes of 16 cc.
...
...
...
...
2
...
9 + + + + - + - - III
Do.
...
...
„ I I , 1 0 .
3
„
5 cc.
...
...
...
...
3
1 10 + + + + - + - - III Do.
...
...
„ I I I ,
n i l .
3
„
1 cc.
...
...
...
...
2
3
3
„
.1 cc. ... ... ... ...
. . . . .
3
3
„
.01 cc. ... ... ...
. . . 3
Fœcal bacilli in 1 cc. and upwards.
No vibrios in 100 cc.
SAMPLE III.—TAP NEAR SEEVARAM TOLL-GATE.
1
+ - + - - - + -
I I B. Schæfferi.
2 + - + - - - + - II
Do.
... Group I, nil.
Total colonies per cc. on agar at 37° C.-75.
3 + - + - - - + -
I I
Do.
... „
II, 9.
4 + - + - - - + - II
Do.
... „ III, nil.
5 + - + - - - + -
I I
Do.
...
„ IV, 1.
Bile salt lactose, medium
+
-
6 + + - - - + - -
I V B. 112.
1 tube of 20 cc.
...
...
...
..
1 ...
7 + - + - - - + - II B. Schæfferi.
8 + - + - - - + -
I I
Do. ... C l a s s I , 9 .
2 tubes of 10 cc.
...
...
...
...
2
...
9 +
-
+ - - - + - II
Do.
... „
II, nil.
3
„
5 cc.
...
...
...
...
2
1
1 0 + - + - - - + - -
I I
Do.
...
...
„ I I I ,
n i l
.
3 „ 1 cc.
...
...
...
...
3
Undetermined 1
3
„
.1 cc.
...
...
...
...
3
3 „ .01 cc.
...
...
...
...
3
Fœcal bacilli in 5 cc. and upwards.
No vibrios in 100 cc.
REPORT.
As was the case last year the water from the Infiltration Gallery is extremely pure, but unfortunately the
deterioration in the water as distributed which was noted last year is again in evidence. The polluting
matter is too of a much more objectionable kind, the susceptible organisms of class I being present. This
pollution is again associated with low total counts and great organic purity of the water, so it is difficult to
account for. Possibly there may be minute defects in some of the joints and circumstances at this season
may lead to the production of considerable negative pressures in the pipes, resulting in small quantities of
objectionable matter being sucked in. However caused, it is a great pity to see such good water spoiled.