Back in the 40's in England some of the large operations (e.g., R.O.B.
Manley) made a practice of placing a small bottle of methyl salycilate (?)
in each hive.  It was set right on the floor, and tucked away in a rear
corner.  A wick of some sort came up thru the cap of the jar. It was part
of the winter preparations.  I'm trying to recall what this was for;
evidently tracheal mites (acarine).  Is this still practiced, or was it
totally abandoned for some specific reason?  Could it hold promise?
Interested in any info,  thanks.