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RESULTS OF THE CHEMICAL AND BACTERIOLOGICAL
EXAMINATION OF THE LONDON WATERS FOR THE SIX MONTHS
ENDED APRIL 30, 1906.
During the six months ended April 30th, 1906, 5,533 samples of
water have been examined either chemically or bacteriologically,
exclusive of 309 samples collected for special purposes.
The chief analytical results may be summarised very briefly, as
follows :—
I. Bacteriological Results.
Table 1.—Average number of microbes per c.c.
Raw Waters.
Filtertd Waters (including Kent uniiltered water).
Inclusive.
1
Exclusive
2
Kent
3.2
2.0
New River
859
New River
6.2
6.0
River Lee
2,728
East London (Lee)
9.8
7.7
East London (Thames)
13.9
11.7
Chelsea
5.9
3.5
River Thames
1,282
Grand Junction
8.4
6.4
West Middlesex
7.1
6.7
Southwark and Vauxhall
25.0
13.9
Lambeth
8.6
7.9
Thames derived Waters
11.2
8.0
Grand Total
9.8
7.3
1 Inclusive of all the results.
2 Exelusive of samples containing 100 or more microbes per c.c.
II. Chemical Results. 1
(Parts per 100,000, unless otherwise stated.)
Table 5.
Albuminoid
Nitrogen.
Oxygen absorbed
from Permanganate.
Colour (paper
filtered) m.m. brown,
2 ft. tube.
Turbidity,
Saccharated
Carbonate of Iron.
Raw
Water
New River
.0083
.0722
34
2.51
R. Lee
.0175
.1698
77
4.37
R. Thames
.0162
.1739
77
3.66
Filtered Water
(including Kent unfiltered
Water).
Kent.
.0016
.0078
0
Practically all the samples of
filtered water were free from
any appreciable amount of
suspended matter.
.0035
.0319
9
E. London (Lee)
.0063
.0663
17
E. London (Thames)
.0066
.0696
18
Chelsea
.0067
.0823
20
W. Middlesex
.0072
.0687
18
G. Junction (Hamp.)
.0082
.0671
18
G. Junction (Kew)
.0080
.0704
18
Lambeth
.0075
.0945
23
S. anti Vauxhall
.0072
.0846
22
\Thames derived Waters
.0073
.0767
20
1 The chief results only are given.
From Report by A. C. HOUSTON.