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less risk to other domestic animals. The use of Warfarin in this
Borough has proved very satisfactory. Other experiments, not
conducted in Wembley, however, appear to indicate that Warfarin
can be added to tracing dusts which are fairly heavily sprinkled
in the run-ways and approaches to rat holes in buildings, with the
idea in mind that rodents will contaminate their fur and feet and
tails, and that during subsequent cleaning they will ingest sufficient
Warfarin in time to prove lethal to them. This method might
well prove beneficial in cases where there is an alternative food
supply and there is a reluctance on the part of rats to feed on
prepared baits.
The following statistics relating to the treatment of sewers
have been provided by the Borough Engineer and Surveyor. In
February/March, 1952, a 10% test bait of sewer manholes was
carried out. 355 manholes were baited and there were 9 partial
takes and 8 complete takes. In the treatment which followed
381 manholes were baited when there were 126 partial takes and
21 complete takes. The corresponding figures for the 13th Maintenance
Treatment carried out in August, 1952, were:—manholes
baited 252, partial takes 60; complete takes 7.
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