Fallowing Michael's referal to the article about Hopkins methode of queen rearing (great) I red another article at the same site.http://www.beesource.com/pov/hayes/abjaug85.htm
Very good article. I suppose all of us use eather kind of hives, what are your opinions? It looks like upper entrance is realy good thing. But thinking about the ventilation shouldn't we more ventilate the top of the hive. We use screened bottoms, but wouldn't be sreened inner cover and the outer one better?