67
TABLE IX (a)--cont.
Tabular Statement of Results of Analyses of Red Bills Lake—cont.
Sample
'number.
Date of
taking g
sample.
Sample
taken from
Total
F e c a l
colonies bacilli
Agar
37°C.
in
Organism present and
number.
Depth
o f water ter
in lake.
Rainfall and other
remarks.
12b
Jan. 26 Bottom 14'.
860
5 cc. 8 Cloacm, 2 lactis
æ r o g e n e s
13' l No rain ; irrigation
water
probably
admitted.
12c
13a
, ,
Feb. 3
Middle 7'.
Surface.
...
68
5 cc.
50 cc.
10 Grunthal
8..
Nil
...
...
...
...
. . .
12.7' No rain.
13b
, ,
Bottom 16'.
150
5 cc. 8 Cloacm, 1 lactis æærogenes,
1 No. 73.
...
1 3 c
14a
, ,
Feb. b
Middle 8'.
Surface.
56 50 cc.
350 10 cc.
6 Acidi lactici, 1 grunthal,
...
1 No. 6, 2 No. 101.
5 Cloac, 5 No. 67 ...
... 12 . 54' No rain.
1 4 b
, ,
Bottom 18'.
420
5 cc. 4 Cloacm, 6 No. 73 ...
...
1 4 c
15a
, ,
Feb. 15
Middle 8'.
Surface.
380
360
10 cc.
20 cc.
10 Grunthal
...
. . .
7 Lactis æmrogenes, 2 No. 67,
1 cloacw.
. . .
12.4'
15b
Bottom 16'.
480 i 1 cc.
I Grunthal, 7 cloacm, 2
coscoroba.
•..
15c
,,
16a
Mar. 1.
Middle 8'
Surface.
280 20 cc.
320 50 cc.
Plate spoilt
...
Nil..
...
12'
16b
,,
Bottom 14'.
380
3 Cloaca, 6 lactis æmrogenes,
1 No. 101.
16c
„
j Middle 7'.
510
'1 cc. 4 Coscoroba, 1 pneumonim,
2 No. 6, 1 No. 67, 1 No.
101, No. 73.
.17a
Mar. 8
Surface.
310 50 cc. Nil
...
...
...
...
11.5'
17b
Bottom 15'.
410
'1 cc. 6 Lactis æerogenes, 1 cosco-
roba, 3 No. 101.
...
17c
1 8a
,,
Middle 7'.
Mar. 17 I Surface.
3,501 i '1 cc.
Useless 50 cc.
9 Cloacae, 1 coscoroba
10 Lactis æærogenes ...
...
...
...
plate.
181)
,.
Bottom 16'.
1
80
5 cc. 8 Coscoroba, 1 cloacae, 1
...
neapolitanus.
18c
•„
Middle 8'.
120
5 cc. 10 Coscoroba
...
...
It would be difficult under ordinary natural. circumstances in India to distinguish
between the effect of storage (which may be taken to mean the resultant of all forces),
:and the effect of sunlight by itself ; to demonstrate this would necessitate a special set
.of laboratory experiments ; we do not propose to distinguish between the action of
storage as apart from that of sunlight. But, we think, it may reasonably be supposed,
that any results obtained on the action of sunlight only, would not be at variance with
those obtained on the action of storage, the former being a part of the latter.
In our work on the Red Hills lake we took weekly samples from the surface,
.middle and bottom ; these were analysed in the usual way, the results, considered.
in connection with meteorological. changes, are set forth in table IX (a) which should
be carefully studied.
The results obtained in these analyses are disappointing in some directions.
'They are not -very regular and they do not demonstrate any very regular sequence
in the falling off of organisms. The reason for this is perfectly simple, namely, that
although the lake is a huge body of water, it has a very large catchment area, and
possesses 4 or 5 large inflow channels. Analysis has proved that these channels bring
in a highly contaminated water, and until these have dried up, it is impossible
to expect purification at all depths, because there is a constant stream of organism
coming in.
Let us consider the various analyses in order. The results obtained in samples
1 and 2 have formed the subject of Chapter V, it is not therefore necessary to discuss
these remarkable results, which were obtained just at the bursting of the monsoon.