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Overall Totals s-
WARFARIN 13 Rats
"1080" 13 Rats
SUMMARY;
WARFARIN ("RAX" POWDER) at 0.025$ laid for 10 days at 24 stations
on the top floor
Total Rats Recovered:- 12 F and 1 Mo = 13 R.rattus
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"1080" POISONED WATER at 0.25^ concentration laid at 20 points of
l-oa» capacity for 3 days on top floor.
Total Rats Recovered;- 9 M and IF = lOR^rattus
"1080" POISONED WATER at 150 points for 5 days
Total Rats Recovered3 M.
It is to be expected that some rats will be recovered when stored
cargo is moved, as in the case of No. 3 warehouse, where 12 dead rats
have been recovered since the operation was completed.
No recent evidence of live rats remains in either warehouse.
This experiment demonstrates the superiority of '1080' over an anti-coagulant
as a rodenticide, but it must be remembered that '10808, as mentioned above, can
only be used in places where the strictest control can be exercised and, therefore,
its relative value is greatly reduced as a general rodenticide. One of the
principal defects in the use of an anti-coagulant is the difficulty in finding a
bait which rats will readily take in preference to foodstuffs which they are
normally consuming, particularlv in the case of granaries. A good deal of work
has still to be done in finding preferential baits for use with anti-coagulants.
SHIPS.
A Certain amount of experimental work has already been carried out in the use
of '1080s for the destruction of localised infestations in ships with a view to
obviating the expenses and numerous difficulties associated with fumigation with
hydrogen cyanide. Very successful results have so far been attained^ as is shown
by the following examples :
DISINFESTATION OF MICE - "1080"
S.S. "RAVENSPOINT" (Nett Tonnage 988).
LONDON DOCK
CONSTRUCTION: A shelter deck vessel with 2 large holds which are served by
4 hatches. The amidship section of the shelter deck is screened
by 2 steel bulkheads with two fabricated wooden gangway entrances
in each bulkhead. The enclosed space is used as wing-bunker space.
A short but wide and deep cross-bunker is located between No. 1.
hold and the boiler-room. A short tonnage space, also linked to
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