The Sun.
London, England, 1864-02-11 00:00:00

METROPOLITAN WATERS IN JANUARY, 1864.

According to the analyses of Dr. Robert Dundas
Thomson, F.R.S., the London waters contain from
one to two grains of greater amount of total impu-
rity than in the preceding month. The organic im-
purity is also:greater in all the Thames waters. The
Southwark water exhibits little or no deposit,
which it did in great excess in the three preceding
months. The Kent possesses no surface impurity,
and it is to be hoped may not again be contaminated
with impure surface water. Covent-garden well had
much impurity from soakage, as there was present
no less than -408 grains of ammonia per gallon.
The smallest quantity of organic and total impurity
was obtained from New River water.
Total impurity Organicim
per gallon. purity.
bra. or deg-. grs. or deg.
0•0 0.0

Distilled Water .....
Loch Katrine water, new supply
to Glasgow 2.35 •605
Manchester water supply
"Well, Covent-garden. lOl.lO 21'52

TnAmEs COMPANIES.
Grand Junction 22*01 3'oo
West Middlesex 22'60 2'32
Southwark
Chelsea
Lambeth
OTHER COMPANIES.

Kent
New River
East London
The table is read thus—Loch Katrine water contains in the
gallon 2.35 degrees or grains of foreign matter in solution,
of which •605 degrees or grains are of vegetable or animal
origin.
At the Royal Observatory, Greenwich, the mean
height of the barometer in the week was 30.025 in.
The barometrical reading decreased from 30.29 in.
at the beginning of the week to 29.86 in. on Wed-
nesday. The mean temperature of the air in the
week was 37.8 deg., which is 0.2 deg. above the
average of the same week in 43 years (as deter-
mined by Mr. Glaisher). The highest day tempera-
ture was 50.0 deg. on Wednesday. The lowest night
temperature was 27 9 deg. on Friday. The entire
range of temperature in the week was, therefore,
22.1 deg. The mean temperature of the water of
the Thames was 40'8 deg. The difference between
the mean dew-point temperature and air tempera-
ture was 4'6 deg. The mean degree of humidity of
the air was 83, complete saturation being repre-
sented by 100. There was hoar frost on Sunday
and Monday. A little rain fell on Tuesday and
Wednesday, and snow fell on Thursday, Friday,
and Saturday.

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