> > I would like to know what the pro and cons are of inner covers, that > are made of glass. > > ll, I inheirited some plexiglas ones from my dad years back. They > have been in use on overwintered hives for years now with no ill > effects. (We have a notch in the lower side of the front for > upward ventillation in winter). Regards Allen W. Allen Dick, Beekeeper VE6CFK RR#1, Swalwell, Alberta Canada T0M 1Y0 Internet:[log in to unmask] Honey. Bees, & Art <http://www.cuug.ab.ca:8001/~dicka>