41
SAMPLE V.—FOUNTAIN IN FRONT OF POLICE STATION.
Numbe r . L a c t o s e .
S a c c h a r o s e .
Dul ci t e. Ad o n i t e . I nul i n.
V o g e s a n d P r o s k .
Indol.
Mo r t i l i t y .
Gr o u p .
Name of Bacilli.
Group and
Remarks.
Total colonies per cc. on agar at 37°C. ― 670.
Bile salt lactose, medium
+
—
1 tube of 20 cc. ...
... ... ...
1
. . .
1 + — — — — — + — I B. Vesiculosus
... Group I, 10.
2 tubes of 10 cc. ...
...
...
...
1
1
2 + — — — — — + — I
Do. . . .
,,
II, nil.
3
,, 5 cc. ... ... ... ...
2
1
3 + — — — — — + — I
Do. . . .
,, III, nil.
3 ,,
1 cc. ... ... ... ...
1
2
4 + — — — — — + — I
Do.
...
,, IV, nil.
3 „
.1 cc. ... ...
...
...
. . .
3
5 + — — — — — + — I
Do.
3 ,, .01 cc. ...
...
...
...
. . .
3
6 + — — — — — + — I
Do.
... Class I, nil.
Fœcal bacilli in 5 cc. and upwards.
7 + — — — — — + — I
Do....
II, nil.
8 + — — — — — + — I
Do.
...
„ III, 10.
Vibrios present in 100 cc.
9 + — — — — — + — I
Do.
10 + — — — — — + — I
Do.
REPORT.
The results on this occasion are of considerable interest. Sample I drawn from the Samalkota Canal
must be considered a river water, and, excepting for its high total count, is not bad. The results got with
sample II indicate once more what a valuable measure simple storage is. The sample shows a sixty-fold
decrease in the fœcal germs and a ten-fold decrease in the total count. There is, however, a set back to this
satisfactory state of affairs in the presence of vibrios. There seems to be no way to account for their presence
except that they are survivors from those present last November, when these objectionable forms were found
in all the samples. It follows, of course, that if these organisms are capable of surviving so long, signifi-
cance of their presence becomes largely reduced, and it will be necessary to apply tests more precise than mere
morphology to indicate their position with reference to cholera vibrios. Sample III taken after the water has
passed through the filter beds is again not so good. This is no new state of affairs at Cocanada, but there is
evidence to show that the deterioration of the water is more likely to be due to the post filtration passages than
to defective efficiency in the filters. Thus there are no vibrios in samples III and IV. So the filters are
removing these organisms but they are again in evidence in sample V, again probably survivors from last
November. Sample IV is in very good order, and showing no vibrios must rank before sample II. Sample V
is a long way behind in quality, but it seems as if this must be due to past inefficiency in the filtration.
Chemically the water is medium in quality. It contains a good deal of organic matter of animal origin,
and though much of this is removed by filtration there is still too much in the water as distributed.
Chemical Analyses.
SAMPLE II.
SAMPLE IV.
Physical appearances.
Colour and
Transparency.
Slightly
yellowish and
hazy.
Slightly
yellowish but
clear.
Smell.
None.
None.
QUANTITATIVE.
Total solids
...
...
... ...
. . .
. . . . . .
Parts per 100,000 ...
18.000
17.000
Temporary hardness ...
... ... ... . . .
. . .
D o .
...
6 . 5 0 0
6.500
Permanent hardness ...
... ...
. . . . . . . . .
D o .
...
1 . 5 0 0
1.500
Total hardness
...
... ...
...
...
...
D o .
...
8 . 0 0 0
8.000
Chlorine
...
...
... ...
...
...
. . .
D o .
...
1 . 4 2 0
1.420
Ammoniacal nitrogen
... ...
...
...
...
D o .
...
0 . 0 0 6
0.002
Alburninoid nitrogen ...
... ...
...
...
...
Do.
...
0.022
0.009
Oxygen absorbed ( Tidy's Process) ...
. . . . . .
. . .
Do.
. . .
0.128
0.077
Nitric nitrogen
...
... ...
... ...
. . .
D o .
...
0 . 0 2 5
0.037
QUALITATIVE.
Nitrites
...
...
... ...
...
...
... ... ...
. . . . . .
Nil.
N i l .
Sulphates ...
...
... ...
. . . . . . . . . . . . . . . . . . . . .
Present
Present
Phosphates ... ... ... ... ... ... ... ... ... ... ...
N i l .
Nil.
Iron, poisonous metals ... ...
...
...
... ...
...
. . . . . .
Nil, nil.
Nil, nil.
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