140
(I) THE INTAKES.
THE UNFILTERED WATERS.
The results of 119 samples of water taken from four intakes have been given.
For comparative purposes it will be best to take only those organisms which give the reactions of true B. Coli Communis (Escherich) ie. II 34, or where Group reactions only are used, the Group + ( S − D + ).
Whatever difference of opinion there may be as to the significauce of many of the other organisms isolated, it may be taken that true B. Coli Communis means recent fæcal contamination. There is however no bacteriological evidence to prove whether that contamination was human or animal in origin.
The following table gives the comparative results:
Table VII.
Intake.
Date.
Group +(S-D+
II 34
Amount of
sample.
%
alo
28.3.11
+
2 cc.
3.4.11
2 cc.
7.4.11
1 cc.
10.4.11
+
Pine Wood Nullah
26.4.11
+
30 samples
27.4.11
+
Not worked out
2 cc.
1 cc.
ro cc.
28.4.11
2 cc.
2.5.11
+
1 cc.
8.5.11
+
ro cc.
24.1.11
+
cc.
13.2.11
+
+
10 cc.
20.2.11
+
5 cc.
4.3.11
+
2 cc.
No. 1 Syphou
57 samples
1.4.11
+
5.4.11
+
5.5.11
+
8.5.11
+
Not worked out
1 cc.
A cc.
cc.
18.2.11
+
Mount Austin
16 samples
4.3.11
18.2.11
+
+
1 cc.
Plunkett's Gap
16 samples
3.3.11
+
2 cc.
30% of all samples.
1 cc.
14% of all
samples.
5 cc.
2 cc.
12.5% of total
samples.
12.5% of total samples.
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