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112
especially in fresh water, by learners, without some water being
swallowed. Polluted water, such as that of the Lee Navigation
Stream, would, if swallowed, set up intestinal disease.
For these reasons, I am of opinion that the water of the
Navigation Stream is unfit to be used for bathing purposes.
1 remain, Gentlemen,
Your obedient Servant,
J. KING-WARRY, M.D., D.P.H.
Medical Officer of Health.
Analysis of River Lea Water by Mr. Leo Taylor, F.I.C., Public
Analyst:—
Public Analyst's Laboratory,
31, Moorgate Street, E.C.
November 7th, 1907.
1429.
Certificate of Analysis.
Sample of Lee water received from Dr. J. King Warry on
October 22nd, 1907.
Sample Mark—Lee water taken 40 yards below Tottenham
Sewage Works, October 21st, 1907.
Seal—Public Health Department.
On Analysis the Sample yielded:—
Total Solid Residue 646 grains per gallon.
Organic matter in solution 5 6 „ ,,
Chlorine 4.7 ,, „
Free Ammonia .896 ,, „
Organic Ammonia .0952,, ,,
Oxygen required (4 hrs. at 70° F.) .607 ,, ,,
Nitrates as N .266 ,, „
Suspended matter 17.0 „ „
Sulphuretted Hydrogen Absent.
The sample was turbid and possessed a very slight earthy odour
when slightly warmed. It was light brown in tint when viewed in
a white basin.