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The suspended matter consisted of finely divided earthy matter,
and there were also a few particles of duckweed floating on its
surface.
These results are indicative of a polluted river water in time of
of partial flood.
(Signed) LEO TAYLOR, F.I.C.,
Public Analyst.
Public Analyst's Laboratory,
31, Moorgate Street, E.G.,
1574. December 11th, 1907.
Certificate of Analysis.
Sample of Lee water received from Dr. J. King Warry on
December 5th, 1907.
Sample Mark—From River Lee at Lee Bridge, December 4th,
1907.
Seal—Hackney Borough Council.
On Analysis the Sample yielded:—
Total Solid Residue 21.5 grains per gallon.
Organic matter in solution .5 ,, ,,
Chlorine 4.9 „ „
Free Ammonia 1.4 ,, ,,
Organic Ammonia .266 „ „
Oxygen required (4 hrs. at 70° F.) .436 „ ,,
Nitrates as N .262 „ „
Suspended matter 4.0 „ „
Sulphuretted Hydrogen Absent.
The sample was fairly clear and possessed a very slight earthy
odour when slightly warmed, and when examined in a white basin
was a very light yellowish brown in tint.
A little duckweed was floating on the surface.
The organic matter is very high and indicates pollution, but
this may be due to the excessive rainfall and consequent flooded
condition of the river.
(Signed) LEO TAYLOR, F.I.C.,
Public Analyst.
H