111
SAMPLE 1X.—KODAPPAMUNDRESERVOIR.
Numbe 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
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˚— 60
Bile salt lactose, medium.
+
—
1
+ — + — – + +
II B. Colicommunis.
1 tube of 20 co. of water taken
. . . . . .
1
. .
2
tubes of 10 cc.
„
2 + — + — — — + —
II
B. Scháfferi.
Group
I n i l
2 2
. .
3
„ „
5 cc.
„ „
3
+ —– + — — —
—
II
Do.
"
I I
n i l
3
„ „
3
„
1 cc.
"
4
+ — +
+
— — —
+
+ —
II
Do.
.. G roup, I, nil.
4
. .
3
„
.1 00
,I
..
..
, ,
..
„
5
+ — + — ,— — + —
II
Do.
. .
"II, 10.
III, nil.
. .
..
+ _ +
—
_ _ + _
II
Do.
„
6
..
3
3
" .01. cc. „
7 + — + _ _ — +
++
II
B. Colicommunis.
. . . .
„
V, nil.
Fœcal bacilli in 1 cc. and upwards.
8
+ — + — — — +
+
II
Do.
.. Class
I, 10.
9
+ — + — _ _ — + —
II
B. Soháfferi
II, nil.
10
+ — + — — — + — II
no...
„ nil
III, .
No vibrios in 100 cc.
REPORT.
The results got on analysing the water from the various sources of the Ootacamund supply are, on this
occasion extremely variable, and range from exceedingly good to exceedingly bad. A strange reversal from
past experience the Marlimund reservoir heads the list for purity and bacteriologically is extremely good.
Chemically however the water is the worst of those examined and as usual shows a high figure for organic
matter which is probably of animal origin. The Marlimund pipe line water is very much worse and shows a
surprisingly large variety of species among its fœcal germs. This suggests suction of surface pollution into
the pipe.
The Dodabetta reservoirs rank next and their waters are really exceedingly satisfactory. In contrast to
what happened in the Marlimund pipe line we find that the water in the Dodabetta pipe line has been
greatly improved and of all the samples collected on this occasion it is the best. The condition of the water
in this part of the system leaves little to be desired for although the organic matter is on the high side it
appears to be of vegetable origin.
The water of the Tiger Hill system is also exceedingly good and taken all round, becteriologically and
chemically is the best of the lot.
The condition of the water in the Kodappamund reservoir is very different and shows evidence of very
recent pollution. The pollution may not have been very extensive but it is very objectionable, true bacillus
coli communis, the type species of excremental pollution being present.
The pollution of the Old Ootacamund Cistern has been both extensive and recent, so the water is in a
thoroughly unsatisfactory state. This result is very hard to explain as on previous occasions, and even after
heavy rain, the water of this cistern has been remarkably pure.
With the exceptions noted above the chemical condition of the water from the various supplies is
excellent.
Chemical Analyses.
.
SAMPLE I. SAMPLE II
Physical appearances.
Colour and
Transparency.
Yellowish but clear.
Slightly yellowish
but clear.
Smell.
None.
None.
QUANTITATIVE.
Total solids
..
..
..
..
..
Parts per 100,000
..
2.600
2.400
Temporary hardness ..
..
..
..
Do.
Nil.
Nil.
Permanent hardness ..
...
..
..
Do....
0.500
0.500
Total hardness ..
..
..
..
..
Do.
0.500
0.500
Chlorin
"
..
—
.,
. .
Do.
—
0.355
0.355
Ammoniaoal nitrogen
..
..
..
Do.
0.003
0.003
Albuminoid nitrogen ..
..
..
..
Do...
0.012
,
0.002
Oxygen absorbed (Tidy's .Process) ..
Do...
0.060
Nitric nitrogen
..
..
..
..
Do.
. .
Nil.
Nil.
QUALITATIVE.
Nitrites ..
..
..
..
..
..
..
..
..
. .
Nil.
Nil.
Sulphates ..
....
..... .
..
....
. .
Nil
Nil.
Phosphates
...
.. .. ..
..
..
..
..
. .
Nil.
Nil
Iron, poisonous metals ..
..
..
. .
.
. . .
Nil, nil.
Nil, nil.