SAMPLE IX.—MARLIMUND PIPE LINES.
N u m b e r s .
L a c t o s e .
S a c c h a r o s e .
D n l c i t e . Adoni 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 .
Gr o u p .
Name of Bacilli.
Group and
Remark
s.
Total colonies per cc. on agar at 37° C.—412.
Bile salt lactose, medium.
+
-
1 tube of 20 cc.
...
. . .
. . .
. . . 1
. . .
1
+ + - - - - + - IV B. Coscoroba
... Group 1, nil.
2 tubes of 1.0 cc.
. . .
....
. . .
. . .
2
. . .
3
5 cc.
...
..
. . .
. . .
1
2
2
+ + - -
- - + - IV
Do.
...
„
II, nil.
3
1cc.
. . .
. . .
. . .
. . .
. . .
3
3
+ + - -
- - + - IV
Do. . . .
,,
III, nil.
3
„'1cc. .
...
...
....
...
...
3
4
+ + - -
- - + - IV
Do.
...
„
IV, 10.
3
„
'01 cc.
...
...
..
...
...
3
5
+ + - -
- - + - IV B. 106.
...
6
+ + - -
- - + - IV B. Coscoroba.
Fæcal bacilli in 10 cc. and upwards.
No vibrios in 100 cc.
7
+ + - -
- - + - 1V
Do.
8
+ + - -
- - + - IV
Do.
... Class
I, nil.
9
+ + - -
- - + - IV
Do.... ,,
I I , 1 0 .
10
+ + -
-
-
-
-
+ - IV
Do. . . .
" I I I ,
n i l .
REPORT.
The results on this occasion are characteristic of the season when there has been only a moderate rainfall.
As regards freedom from excremental germs, the Tiger Hill System takes the lead, but curiously enough the
water from this system shows the highest total counts of any. This would appear to prove that the gathering
ground is kept effectively clear from trespass by man or large animals. Next in order of purity comes the
water of the Dodabetta System, and it is really very good. A curious feature is the presence of an organism
that rapidly swarms over the plate, rendering a count of the colonies impossible. In the water of the lower
reservoir there was however only one such colony, so it is not likely that there were many in the plate that
could not be counted. The plate inoculated with water of the Dodabetta pipe-line showed only twelve
colonies per cc., which may be taken as a very fair indication of the number in the water of the upper
reservoir.
Bacteriologically the water from the Marlimund and Kodappamund Reservoirs and that from the Old
Ooty Cistern may be taken together. The total counts are low to moderate and there is only one excremental
germ of an unobjectionable kind in five to ten cc. of the water.
Chemically there is nothing new to note. The water from Tiger Hill and the Upper Dodabetta
Reservoirs shows a rather large amount of organic matter with a high carbon-nitrogen ratio query of
vegetable origin ? The Marlimuud water shows the usual large amount of organic matter having a low
carbon-nitrogen ratio, query of animal origin ?
Chemical Analysis.
TAP IN FRONT OF
KODAPPAMUND.
TAP IN FRONT OF
OLD OOTY CISTERN.
Physical appearances.
Colour and
Transparency.
Slightly yellowish
but clear.
Colourless and clear.
Smell.
None.
None.
QUANTITATIVE.
3'000
3'400
Total solids ... ... ...
...
... Parts per 100,000
...
Temporary hardness
...
...
Do
..
N i l .
Nil.
Permanent hardness
...
. . .
...
Do
...
0 ' 7 5 0
1'500
Total hardness
...
...
...
...
Do
...
0 ' 7 5 0
1.500
Chlorine
...
...
...
Do
...
0 ' 3 5 5
0'426
Ammoniacal nitrogen
...
...
...
Do
...
T r a c e .
Trace.
Albuminoid nitrogen
...
...
...
Do
...
T r a c e .
0'002
Oxygen absorbed (Tidy' s Process)
1)o
. . .
0'054
0'027
Nitric nitrogen
...
...
...
...
Do.
...
Nil.
NIl.
QUALITATIVE.
Nitrites
...
...
...
...
...
...
. . .
. . .
. . .
Nil.
Nil.
Sulphates ...
...
...
...
...
...
...
...
...
Nil.
Nil.
Phosphates ...
...
...
...
. . .
. . .
..
. . .
Nil.
Nil.
Iron, poisonous metals
...
...
...
...
...
...
...
Nil, nil.
Nil, nil.