302
Sample I.—From the Reservoir at
C o l o n y
N o .
S a c c h e r o s e .
D u l c i t . A d o n i t .
I n u l i n .
Vo g e s a n d
Pr os k.
M o b i l i t y .
G r o u p .
Bacillus.
Group
a n d R e m a r k s .
(a) Total colonies on agar at 37°—69 unfiltered.
( b ) Bile salt glucose, medium.
1 + - - - + - IV B . Cl o a c æ*
+
-
2 + - - - + - IV
Do.
3 + - - - + - IV
Do.
1 tube 20 cc. of water taken ..
1 ..
4 + - - -
+ - IV
Do.
Group I
2 tubes 10 cc.
,, ....
2 ..
5 + - - -
+
- IV
Do.
,, II
4
, , 5 cc.
,, .. 4 ..
6 + - - - + - IV
Do
,, III
7 + - - - + - IV
Do.
,, IV
5
, , 1 cc.
5
,,
. .
8 + - - - + - IV
Do.
5
,,
.1 cc.
,,
.. 2 3
9 + - - - + + IV
Do.
2
3
5
.01 cc.
,,
,,
..
10 + - - - + + IV
Do.
(c) Fœcal bacilli in 1 cc. and upwards.
11 + - - - + - IV
Do.*
12 + - - - + - IV
Do.
(d) Sporogenes milk test doubtful in 20 cc.
Sample II.—From first tap after filtration after 2 miles
and 3 furlongs from head works.
1 + - - - + - IV B. Cl oacæ*
2 + - - - + - IV
Do.
3 + - - - + - IV
D o .
(a) Total colonies on agar at 37°—3.
4 + - - - + - IV
Do.
(b ) Bile salt glucose, medium.
5 + - - - + - IV
Do.
+
-
6 + - - - + - IV
Do.
Group I
7 + - - - + - IV
Do.
, II
1 tube 20 cc. of water taken ..
1
. .
8 + - - - + - IV
Do.
,, III
2
..
9
+ - - - + - IV
Do.
2 tubes 10 cc.
,,
..
, , I V
10 + - - - + -
I V
Do.
4
, ,
5 cc.
2 2
,,
..
11
+
- - - + -
I V
Do.
5
..
5
, , 1 cc.
,,
..
12 + - - - + - IV
Do.
5
. .
5 ,
. 1 c c .
,, ..
5
5
„
. 0 1
c c .
,, ..
. .
( c) Fœcal bacilli in 8 cc. and upwards.
( d ) Sporogenes milk test not present in 20 cc.
Sample III.—From the easternmost tap near the
beach.
1 - - - - - -
I B Grunthal *
2
+
-
-
- + -
I V
B. Cloacæ*
( a) Total colonies on agar at 37°—Countless.
3 - - - - - -
I B. Grunthal*
Group I
4 - - - - + -
I B. Cloacæ*
,, II
(b ) Bile salt glucose, medium.
+
-
5 + - - - + - IV
Do.
,, III
6 - - - - - -
I B. Grunthal*
,, IV
1 tube 20 cc. of water taken ..
1 ..
7 - - - - - -
I
D o .
2 tubes 10 cc.
,,
.. 2 ..
8 + - - - + - IV B. Cloacæ*
9 + - - - + - IV
Do.
4
, , 5 cc.
, , . .
4
. .
10 - - - - - -
I B. Grunthal*
5
, , 1 cc.
,,
. . 5 ..
11 + - - - + - IV B. Cloacæ*
5
, ,
. 1 c c .
, , . .
3
2
5 „ .01cc.
,,
..
1
4
12 + - - - + - IV
Do.
(c ) Fœcal bacilli in .1 cc. and upwards.
( d ) Sporogenes milk test not present in 20 cc.
Sample IV from the western end of town near the Railway Station similar result as sample III in bile salt medium.
REPORT.
(i) The sample of the reservoir water is fairly good for unpurified water; there are fœcal bacilli in 1 cc.
is, however, some evidence in favour of the belief that the pollution is of old standing.
(ii) The filtered water taken at head works shows a considerable amount of purification of the water; the object
bacilli are present in 8 cc, but a greater degree of purity could be obtained if the sand in the filters was more suits
the work; it is much too coarse.
(iii) The sample taken from the town of Vizagapatam shows a considerable increase in the bacteria present;
most probably due to the natural increase in the pipes which are very long, but it may be due to silt formation or to let
Recommendations —
(i) That 12 inches of fine sand from the shore be put on to the filters.
(ii) That the blow off or pipe cleaning cocks be open occasionally to remove any silt that may have formed
pipes. This should be done when water is abundant.
(iii) That the whole pipe line be roughly inspected for leaks. It is not intended that the earth be removed to
but if in any place the dampness of the soil suggests a leak investigation be made and the leak stopped.