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14
preservative. When therefore we cannot advantageously or
effectually supersede the natural process of decay, we must be sure
that we do not hamper it by the injudicious use of antiseptics.
" Dry heat, when it can be applied, is probably the most efficient
of all disinfectants. But we must be sure that the desired temperature
is actually reached by every particle of matter included in
the heated space."
Professor Frankland, by a careful analysis of the water supplied
by the Metropolitan Companies, and a microscopic examination of
the sediment deposited, throughout the year 1875, has shown not
only that the Thames water is less pure than that of the other sources
of supply, but that the proportion of organic matter contained in
water delivered in London, is greatest in that of the Lambeth and
Southwark Companies. This is evident from the following average
proportion for the year :—
Kent TO Grrand Junction 4.2
New River 2.3 Southwark 4.4
East London 3.9 Chelsea 4.4
West Middlesex 4.1 Lambeth 4.5
It will be seen by comparing these resiilts with those of the
previous year, that, while the quality of the deep waters of the
Kent Company has remained stationary, that of all the others has
suffered considerable deterioration. This difference is doubtless
the consequence of rivers being contaminated in their downward
course by the sewage and washings of cultivated lands.
By referring to the annexed Sanitary Table, it will be seen that
your Inspector of Nuisances has diligently discharged those duties
pertaining to his office, during the past year.
It only remains that I should thank the Board, and its Officers,
for their courtesy and co-operation, uniformly afforded through a
period of twenty years.
I am, Gentlemen,
Your obedient Servant,
ROBERT BIANCHI.