48
RAJAHMUNDRY CENTRAL JAIL.
SAMPLES TAKEN—8TH NOVEMBER 1909.
Bacteriological Analyses.
SAMPLE r.—FROM STORAGE RESERVOIR.
C o l o n y n u m b e r .
Lact ose.
Saccharose.
Dul ci t e.
Adoni t e .
Inul i ne.
Vo g e s a n d P r o s k .
i ndol .
Mobi l i t y.
Group.
Bacillus.
Group and
remarks
(a) Total colonies per cc. on agar at 37º—1,890.
(b) Bile salt lactose, medium
+
-
+
1 + – + -
- - IV B. Lactis ærogenes.
Group I , nil.
+
1 tube 20 cc. of water taken
..
2 + + – + - + - - IV
Do.
,, II, nil
2 „ 10 c c .
, ,
. .
1
..
3 + + - + - + - - IV
Do.
,, III, 2.
3 „ 5 cc.
. .
2
. .
4 +
+ — + — + — — IV
Do.
,, IV, 8.
3 „ 1 cc.
, ,
. .
3
. .
5 + + - + - + - - IV
Do.
3 „ .1 cc.
, , t
..
3
. .
6 + + – + – +- – - IV
Do.
3 „ .01 cc.
,,
2
1
7 + + – + - + - - IV
Do.
Class I, nil.
1
2
8 + + + + – + – – III
67
,, II, 10.
9 + + + + + -+ - - III B. Lactis ærogenes.
„ III, nil.
(c)_Fœcal bacilli in .1 cc. and upwards.
10 + + - +
–
+ - - IV
Do.
1
+
+ -
+ –
+ – - IV B. Lactis ærogenes.
Group I, 4.
SAMPLE IL—WELL IN No. 8 BLOCK.
2 +
– - – –
– + –
I B. Vesiculosus
..
„
II , nil.
3 +
+ - + – + – - IV B. Lactis ærogenes.
„ III, nil,
4 + - - – –
– + +
I B. Gruntbal
..
„
IV, 6.
(a) Total colonies per cc. on agar at 37°—3,150.
5 + ++ – + – + – – IV B. Lactis ærogenes.
6 + - - - - --+ –
I B. Vesiculosus
.. Class 1, nil.
+
–
7 + + – + – + – – IV B. Lactis ærogenes.
,, II,, 6.
(b) Bile salt lactose, medium.
8 + + – – – – + – IV B. Coscoroba
,, III, 4
9 + + - - - – + + IV
Do.
1 tube 20 cc. of water taken
..
1
10 +
– - - - – + - I B. Vesiculosus
2 tubes 10 cc.
,, ..
2
. .
3 „
5cc.
,,
. .
. .
3 „
1 cc.
, ,
. .
. .
3 „
.1 cc.
,,
. .
2
1
3 „.01 cc.
,,
. .
. . 3
(c) Fœcal bacilli in .1 cc. and upwards.
. .
REPORT.
Considering sample II first as it represents the source of the water, we find that it presents the typical
features of water drawn from a well sunk in undesirable surroundings, and after there has been a spell o
dry weather. There are plenty evidences of pollution, but this is not of very recent date, but probably
h a s
been pretty extensive. A considerable amount of natural purification has gone on in the water, or, what
amounts to the same thing, the polluting material has been considerably exposed to purifying agencies
before it gained access to the water. The statement that pollution is not of recent date should always
b e
h e l d . t o c o v e r b o t h o f t h e s e m e a n i n g s,
in the case of wells or other small supplies. Both the bacteriological
and chemical examinations point to the same thing. We have fœcal germs in so little of the water as one.
tenth of a cc., but these are all of the more resistant types belonging to Classes IIand Chemicall
y
there is the exceptionally high figure for nitric nitrogen, nitrates being derived from oxidised animal matter.
Otherwise the water though on the hard side is good enough.
Sample No. II shows much the same results. There is no reduction in the number of excremental
germs, but the slight amount of storage has reduced the number of varieties present and also the number of
saprophytic organisms. Chemically the two samples are identical.
Tins water cannot be considered a satisfactory supply, and if no better be available that portion
o f
used for drinking should be boiled during rainy weather, more especially at the beginning of the rains.
After a good downpour has swept off most of the surface pollution, there is not so much risk of the wat
e r
becoming dangerously foul. At present the water is probably harmless enough but we cannot say ho
w
l o n g t h i s s t a t e o f m a t t e r s m a y c o n t i n u e .