Manley described regular use of oil of wintergreen for treating acarine --
I think that was in the 40's.
He used a small bottle set at a rear corner of the hive (on the floor),
with some sort of wick to draw the oil up.  Apparently this treatment was
part of the regular wintering preparations.
 
Perhaps someone in the UK could explain what ever became of this practice
... or, has anyone seen it described or used in other areas?