16 FARMERS’ BULLETIN 1759. 
in or on the ground, these last should be removed and the ground 
soaked with kerosene oil. 
In some cases thorough and repeated drenching of infested timbers, 
where accessible, with kerosene oil may afford temporary relief and 
kill many of the white ants. Kerosene oil should be poured into the 
crevices through which the winged insects emerge and on the ground 
where the earthlike shelter tubes originate. Very rarely, however, 
is any permanent relief effected by these means alone. 
In greenhouses iron frames and concrete work should, wherever 
possible, replace woodwork. The wooden uprights supporting the 
— cen Es a. oa eae alee : ae, ears : ee sere a "ys 
Fig. 13.—Earthlike shelter of the white ant Leucotermes flavipes, built on pine flooring in heated, damp, 
dark basement. ‘The worker termites have come up through cracks between boards of the infested 
floor and made eraterlike openings for the emergence of the winged, sexed adults. Note the shed 
wings on the floor. The swarm occurred February 14, 1916, in an old building in Washington, D. C. 
(Original. ) 
wooden plant benches should be sawed off, if set on or in the ground, 
and rested on stone, bricks, or concrete above the surface of the 
ground. Where woodwork is necessary, wood that is impregnated 
with a 1 per cent solution of bichlorid of mercury should be substi- 
tuted. Wood impregnated with this preservative can be painted 
after treatment. 
Poles, posts, construction timber, and other wood in contact with 
the ground should be treated with chemical preservatives to render 
the wood more resistant to attack by termites. Of the more super- 
ficial methods of preserving timber, brush or dipping treatments 
