34
CONJEEVERAM.
WATER SAMPLES TAKEN-10TH MARCH 1911.
REMARKS.—The river-bed of the Vagavati was dry when samples were taken. The supply is intermittent.
There was no rain since last analysis.
Bacteriological Analyses.
SAMPLE.— TAP IN FRONT OF PUMPING STATION.
C o l o n y n u m b e r .
L a c t o s e .
S a c c h a r o s e .
Dul ci t e.
Adoni t e .
I nul i n.
V o g e s a n d P r o s k .
I n d o l . Mort i l i t y.
Group.
Name of Racilli.
Group and
Remarks.
Total colonies per cc. on agar at 37° C.
—3.
Bile salt lactose, medium
+
—
1 tube of 20 cc. of water taken ...
. . .
. . .
1
No lactose fermenters.
2 tubes of 10 cc.
,,
...
...
. . .
2
3 ,, 5 cc. ,, ... ...
. . .
3
3 ,,
1 cc.
,,
...
...
. . .
3
3 32
. 1 cc. ,,
... ...
. . .
3
3 ,, .01 cc. ,,
...
...
...
3
Fœcal bacilli not present in 60 cc.
No vibrios in 100 cc.
SAMPLE II.--TAP IN WESTERN CORNER, ADJOINING THE
RESERVOIR.
1 + + — + —
+
— — IV B. Lactis ærogenes. Group I, nil.
2 + + — + — + — — IV
D o .
II, nil .
Total colonies per cc. on agar at 37° C.—
8.
3 + + — — — — + — IV B. Coscoroba
...
,, III, n i l .
4 + +
—
+
—
+ + — IV B. 116
...
...
„ IV, 10.
Bile salt lactose, medium.
+
—
5 + + — — — — + + IV B. 106.
6 + + — + — + + — IV B. 116
...
... Class I, nil.
1 tube of 20 cc. of water taken ...
...
1
...
7 + + — — — — + — I V B. Coscoroba
. ...
„
II, 7.
8 + + — + — + — — IV B. Lactis ærogenes.
,, III, nil.
9 + + — + — + + — IV B. 116
... ...
Undetermined, 3.
2 tubes of 10 cc.
,,
...
...
2
...
10 + + — + — + — — IV B. Lactis ærogenes.
3
, ,
5 c c .
„ . . .
. . .
3
. . .
3
„
1 cc.
„
...
. . .
2
1
3
„
cc.
, ,
. . .
. . .
. . .
3
3
,,
. 0 1 c c .
, ,
. . .
. . .
. . .
3
Fœal bacilli in 1 cc. and upwards.
No vibrios in 100 cc.
SAMPLE III.— TAP IN EASTERN CORNER, NEAR SEEVARAM
TOLL-GATE.
1
+
+ — + — + + — IV B. 116
...
... Group I, nil.
Total colonies per cc. on agar at 37° C.—
25.
2 +
+ +
— + — + + + IV B. 115 . . . . . .
II, nil.
3 +
+ — + — +
— — — IV B. Lactis ærogenes.
,, III, nil.
Bile salt lactose, medium.
+
—
4 + + — + — + — — IV
Do.
,, IV, 10.
5 +
+ + — + — + — — IV
Do.
6 + + — — — — + — IV B Coscoroba
... Class
I, nil.
1 tube of 20 cc. of water taken ...
. . .
1
. . .
7 +
+ — + — + — — IV B. Lactis ærogenes.
,,
II,7.
8 + +
—
+
—
+
— —
IV
Do.
,, III, nil.
9 +
+ — + — + + — 1V B. 16
...
... Undetermined, 3.
2 tubes of 10 cc.
„
...
...
2
. . . 10 + + — + — +
—
— IV B. Lactis ærogenes.
3
,,
5 cc.
,,
..
. . .
3
...
3
,,
1 cc.
...
. . .
2
1
3
. 1 c c . , , . . . . . .
1
2
3 , , . 0 1 c c . , , . . . . . .
. . .
3
Fœcal bacilli in 1 cc. and upwards.
No vibrios in 100 cc.
REPORT.
At this season of the year the River Vagavati is usuall y dry, but water of good. quality is got from the
suction well. On this occasion the water was of extraordinary purity, and would pass muster anywhere. A
total count of three per cc. and no fœcal germs in 60 cc. is of course unheard of in an unfiltering river water,
but would be good even as the product of a well-constructed and worked filtering plant: It speaks well for
the efficiency of the Conjeeveram Infiltration Gallery that it can, under any circumstances, yield such a pure
supply. The water as distributed to the town is not nearly so good and it is puzzling to give an adequate
explanation of the means whereby it has acquired such a varied flora of fœcal germs. The small total counts
of 8 and 25 seems to exclude silt and leaks and actual multiplication in water so chemically pure does not
appear likely. As it is however the water is not bad except by comparison with that at the headworks
Chemically it is excellent.