He goes to great lengths to explain why his bottles promote hive longevity by sequentially stacking new bottles below the active one, preventing the diminution of cell size (and hence smaller subsequent bees) from being crowded with the detritus from a pupated nymph.
He claims that the flow-through ventilation with holes at each end prevent overheating, and external insulation he placed before winter (and propolis placed over the vents by worker bees to impede ventilation) keeps the population warm enough to over-winter.
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