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Note— The inspections made during 1907 differ from those of previous years in
that they included a considerable number inspected upon complaint, where choked
drains manifested themselves to the complainants. The inspections of 1905 and 1906
were systematic and non-selective in character. The fewer number of missing
stoppers found in the inspections made during 1907 is accounted for in large measure
by the fact that a large number of the old loose stoppers have been replaced by stoppers
with a locking arrangement, which prevents them from being blown out by any
increase of pressure on the sewer side of the Interceptor. It is to be noted that this
simple accident (displaced stoppers) in itself converts the intercepting trap into a
most dangerous appliance. Practically, in all cases where the stopper is displaced the
sewer ventilates directly beneath the windows of the houses through what is misnamed
the Fresh Air Inlet.
TYPHOID FEVER.
28 cases only of Typhoid Fever were notified during the year.
This gives an incidence rate of 019 per 1,000, by far the lowest
rate hitherto experienced in Willesden.
The continued decline in incidence of this disease is probably to
be attributed to the increasing care bestowed at seaside places upon
the sources of shell fish used for human consumption.
Most of the cases occurring for some years past, there has been