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of much better average quality than that distributed
during the previous year.
Of the waters chiefly derived from the River Lea,
that supplied by the New River Company contained, in
every case, less organic matter than that of the East
London Company, which was generally, in this respect,
somewhat superior to the best of the Thames waters.
Table B shows the maximum, minimum, and
average proportions of organic impurity in each of the
waters, the average amount contained in the Kent
Company's water during the nine years ending
December, 1876, being taken as unity.
In Table C are recorded the results of observations
respecting the freedom from turbidity or otherwise of
various waters, and for the purposes of comparison,
the results of similar observations made in 1868 are
also included.
I have the honour to be,
Gentlemen,
Your obedient Servant,
JAMES STEVENSON,
Medical Officer of Health.
Vestry Hall, Paddington,
June, 1803.