113
CONJEEVERAM.
WATER SAMPLES TAKEN—14TH JUNE 1910.
REMARKS.—There has been about 2·97 inches of rain since last analysis. The river bed of the Vagavati is now dry. The supply is
intermittent.
Bacteriological Analyses.
SAMPLE I.—COLLECTING WELL OF THE INFILTRATION
GALLERY.
C o l o n y n u m b e r .
L a c t o s e .
S a c c h c r o s e .
D u l c i t e
A d o n i t e . I n u l i n .
V o g a 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°—20.
Bile salt lactose, medium.
+
—
1 +
+
— -+
—
+
—
—
I V
B. Lactis ærogenes.
1 tube of 20 cc. of water taken
..
1
. .
B. 112 ..
..
.. Group I, nil.
2 tubes of 10 cc.
..
2
. .
2 +
+ — — — + — — IV
B. Lactis ærogenes ..
3 5 cc.
....... ..
2
1
3 +
+ — + —
+ — — IV
„ II, nil .
„ III, 1.
3 3 ,,
1 cc.
, .
2
1
4 + + — — — + — — IV B. 112
..
.
Do.
....
„ IV, 9.
3
• 1 cc.
..
. .
3
5 +
+ — — — + — — IV
3
• 01 cc.
.. ..
. .
3 6 + + — + — + — — IV B. Lactis ærogenes.
7 + +
+ — — — — — III
?
Class I, nil.
B. Gasoformans
..
„ II, 6.
8 +
+ — + — — — — IV
III, nil.
Fœcal bacilli in 1 cc. and upwards.
9 + + — + — + — — IV B. Lactis ærogenes ..
B. Gasoformans
.. U n d e t e r m i n e d , 4
10 + + — + — — — — IV
No vibrios in 100 cc.
SAMPLE 11.—A TAP IN WESTERN CORNER ADJOINING THE
RESERVOIR.
1
+
+ — + + — + —
IV
?
Group 1, nil.
2 +
+ — + + — + — IV
?
,,, II, nil.
„ III, nil,
Total colonies per cc. on agar at 37°—10.
3 + +
— + + — + — IV
?
„IV, 10.
4 +
+ — + + — + — IV
?
Bile salt lactose, medium.
5 +
+ — + + — + — IV
?
Class I, nil.
+
—
6 +
+ — + + — + — IV
/
7 +
+ — + + — + — IV
?
II, nil.
8
+
+ — + + — + — IV
?
„ III, nil.
1 tube of 20 cc. of water taken
..
1
. .
9
+
+
— + + — + — IV
?
Undetermined, 10.
2 tubes of
cc.
..
. .
3 „ 5 cc.
.. ..
1 . .
1 3
10 +
+ — + + — + — IV
?
3 1 cc.
,,
. .
. .
3
3 ·1 cc., ,
..
. .
3
3„·01 cc.
,, .. . ..
. .
3
Fœcal bacilli in 20 cc. and upwards.
No vibrios in 100 cc.
SAMPLE III.—E ASTERN CORNER NEAR SEE VARAM
P O L L
GATE.
1 + + — + — + — — IV B. Lactis ærogenes.
Group I, nil.
Total colonies per cc. on agar at 37°—30.
2
+ + — + — + — — IV
Do.
..
„ II, nil.
+
+
— + — + — — IV
D o .
. .
4
+ + — + — + — — IV
Do.
..
„ III, nil.
Bile salt lactose. medium.
5 + + —
+ — + — — IV
Do.
..
„ IV, 10.
+ —
+ + — + — + — —
I V
Do.
Class I, nil.
7
+ + —
+ — + — —
I V
Do.
..
1 tube of 20 cc. of water taken
, .
1
. .
Il 10
8
+ + — + — + — —
I V
Do.
..
2 tubes of 10 cc.
. .
1
1
9
+ + —
+ — + — — IV
Do.
.,
„ III, nil.
1
2
3 „5 cc..., ,
10
+ + — + — + — — IV
Do.
..
3,,1 cc
. .
. .
3
. .
3,,·1 cc.
..
3
3 , , . · 0 1 c c
. .
. .
3
Fœcal bacilli in 20 cc. and upwards.
,
No vibrios in 100 cc.
REPORT.
Considered from all points of view the results given on analysis of the present samples are the best on.
record. The water from the suction well contains only one fœcal germ to the cc. and while the number of
species, including one whose susceptibility to the natural purifying agencies has not been determined, is
too large, the very small total count is very decidedly against extensive or recent pollution having taken.
place.
The water drawn close to the reservoir shows a marked improvement and this is main- tained in the
distributary system as shown by the sample collected at Seevaram toll gate. Lt is true that the fœcal
germs of sample II are represented by an unknown species, but a water with only one such germ in 20 cc.
and with a total count of only 10 to the cc. cannot have been recently or dangerously polluted.
Chemically the water is, as usual, very fair.
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