108
SAMPLE V. — FOUNTAIN IN FRONT OF OLD VETERINARY HOSPITAL. C o l o n y n u m b e r .
Lact ose.
Sa c c ha r os e .
Dul ci t e. Adoni t e.
I nul i n.
V o g a s a n d P r o s k .
I n d o l .
Mot i l i y.
Group.
Name of Bacilli.
Group and
Remarks.
Total colonies per cc. on agar at
3 7 º — 2 8 0
Bile salt lactose, medium.
+
—
1 tube of 20 cc. of water taken ..
..
1
. .
1 + + + + + — — III
B. 67 ..
..
.. . Group I , nil.
2 tubes of 10 cc.
2
. .
2 + + — —
— + — — IV B. 112
..
II nil.
3 5 cc.
,, ..
. .
3
. .
3 + + — + — + — — IV Lactis ærogenes
. .
, , I I I , 2 .
3
1 cc.
,, . . . .
1
2
4
+
+
—
+
—
+ — — IV
Do.
, , I V , 8 .
3 ..1 cc.
..
. .
3
5 +
+ — + — + — + IV B. 102.
3 ·01 cc...
. .
. .
3
6 +
+ — — — — — — IV
B. 111.
7 + + + — — + — +
I I I B. 73 ..
..
.. Class I, nil.
Fœcal bacilli in 5 cc. and upwards.
8 + + — + — + — + IV
B. 102
..
..
.. II, 5.
9 +
+ — — — + — — IV B. 112
• •
...
III, 1.
No vibrios in 100 cc.
10 + + — —
— + — — IV
Do.
..
.. Undetermin e d , 4 .
REPORT.
Owing to the lack of rain no sample could be got from the Samalkota canal on this occasion. The water
in the storage tank is, in spite of a rather large number of species of fœcal germs, very satisfactory. F i l
tration in the Madras Presidency is responsible for some very curious effects, and Cocanada has furnished not
a few of these. Generally speaking the results of filtration are shown in deterioration of the water-supply and
with one solitary exception such a result has followed filtration in Cocanada. This exception occurred last
quarter in March when a fairly satisfactory improvement in the quality of the water took place as a result of
filtration. Had the plain speaking of the December Report anything to do with this ? If so, the efforts at
reform have been spasmodic and ill-sustained. On the present occasion, after passing through the new filter,
the water is bacteriologically ten times worse than before, but this state of affairs is bright in comparison to
what has occurred with the old filter. There we find the water a thousand times as bad as the water of the
storage tank. Presumably, this is the filter which brought about a marked improvement in the quality of the
water in March last, only eleven weeks ago. Can such divergent results be explained in any other way than
by bad management ? In passing through the pipes the water has undergone a very marked improvement
In Cocanada this mysterious pipe action has a tendency to run contrariwise to the filters. The water from
the tap in front of the Old Veterinary Hospital maintains its reputation for diversity of species among its
faecal germs. This section of the pipe should be overhauled for leaks.
Chemically, the water has undergone a rather remarkable change. It is considerably harder and the
figure for chlorine has gone up tenfold. As usual the water shows a pretty high figure for organic matter,
some of which at least is of animal origin.
Chemical Analyses.
SAMPLE I.
SAMPLE IV.
Physical appearances.
Colour and
Transpareney.
Yellowish but clear.
Yellowish but clear.
Smell.
None.
None.
QUANTITATIVE.
Total solids ..
..
..
.. ..
Parts per 100,000 ..
31.000
30.600
Temporary hardness ..
..
..
_
Do.
..
7.000
6.000
Permanent hardness ..
.. ..
Do.
..
4.000
4.000
Total hardness
..
..
..
..
Do.
11.000
10.000
Chlorine
..
..
..
..
..
Do.
11.715
11.715
Ammoniacal nitrogen
.. ..
..
Do.
..
0.007
0.004
Albuwinoid nitrogen..
..
..
..
Do.
..
0.025
0.013
Oxygen absorbed ( Tidy's Process) ..
..
Do.
..
0.240
0.120
Nitric nitrogen
..
..
..
. .
Do.
..
Nil.
Nil.
QUALITATIVE.
Nitrites '
..
..
.. ..
..
..
..
..
Nil.
Nil
Sulphates
..
..
.. .. .. .. .. ..
Present.
Present.
Phosphates
..
..
..
..
..
...
..
Nil.
.Nil.
Iron, poisonous metals
. .
. .
Nil, nil.
Nil, nil.