206
SAMPLE V. —FOUNTAIN IN FR0NT OF POLICE STATION.
Total colonies per cc. on agar at 37° C-160.
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 .
D u l c i 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
Re marks.
Bile salt lactose, medium.
+
—
1 + + - + - + - - IV B. Lactis ærogenes. Group I, nil.
1 tube of 20 cc.
.
.
1
..
2 tubes of 10 cc.
. 1
1
2 + + - + - - - - IV
Do.
II,n i l .
3 ,, 5 cc.
2
3 + + - + - + - - 1V
Do.
,, III, nil.
3
1 cc.
. .
3
4 + + - + - + - - IV
D o .
, , 1 V , 1 0 .
3 „
.1 cc. . . . . .
..
3
5 + + - + - + - - IV
Do.
, ,
, 6 + + - + - + - - IV
D o .
3 ,, 01 cc.
..
..
..
..
3
7 + + - + - + - - IV
Do.
8 + + - + - + - - IV
Do.
Class I, nil.
Fœcal bacilli in 10 cc. and upwards.
No vibrios in 100 cc.
9 + + - + - + - - IV
Do.
10 + + -
+
- + -
- IV
Do.
, , I I , 1 0 .
„ III, nil.
REPORT.
The water of the Samal kotta canal i s pretty bad. It shows a most undesi rabl e mi xture of fœcal germs,
pointing to extensive pollution, and. most of these are of class II so that there is not so much evidence of
natural purification having gone on as one would like . It contains vibrios always a bad feature in a water,
and it has a countless number of other germs.
Sample II shows a most notable improvement, demonstrating what a valuable process sedimentation is.
Unfortunately the sedimentation has not succeeded in eiminating the vibrios, and it is disappointing to find
them still in evidence. Possibly more sunning is required and possibly the less resistant varieties of this type
have disappeared, but more information is required on these points.
S a m p l e I I I a l t h o u g h n o t b a d i s n o t s o g o o d a s t h e p r e v i o u s o n e . I t h a s a c q u i r e d a v e r y c o n s i d e r a b l e
total count and there is an increase in the fœcal germs. Vibrios ace still present. Sample IV is again better
but the undesirable vibrios are still in evidence.Judging from these specimens vibrios would appear to have
considerable powers of resistance.
Sample V must be considered the best of the lot as the vibrios have been got rid of and the water
is otherwise satisfactory.
Chemically the water is much as usual now. The increased figures for permanent hardness and chlorine
noted in the second quarter have not been found in the third and fourth quarters. The organic matter,
mainly of animal origin, continues to be on the high side.
Chemical Analyses.
SAMPLE IL
......,— _fir SAMPLE IV.
./... ______I
Physical appearances.
Colour and
Transparency.
Yellowish and hazy. Yellowish but clear.
Smell.
None.
None.
QUANTITATIVE.
Total solids ..
..
. „ . ..
Parts per 100,000 ..
14.400
14.400
Temporary hardness ..
. . . . . .
Do.
4.000
5.000
Permanent hardness ..
..
. , . .
Do...
3 . 0 0 0
2.500
Total hardness ..
..
..
. . . .
Do.. . -
7 . 0 0 0
7.500
Chlorine ..
..
. . .. .. . .
Do.
2.130
2.130
Ammoniacal nitrogen ..
..
..
..
Do.
. .
0.003
Trace.
Albuminoid nitrogen ..
..
. . , .
Do.
0.023
0.014
Oxygen absorbed. (Tidy's Process) ..
Do.
0.116
0.070
Nitric nitrogen ..
..
..
..
. .
Do.
..
0.025
0.037
QUALITATIVE.
Nitrites..
..
..
Nil.
Nil.
Sulphates
. . . - . . . . . . . . .. .. ..
Present.
Present.
Phosphates.. ..
. . . . . . . . . . . .
Nil.
.Nel.
Iron, poisonous metals
..
..
..
..
..
Nil, nil.
Nil, nil.