I found this in a translation by Samuel Wagner of Dzierzon's book:
> What causes a total cessation of a queen's fertility? The queen's fertility decreases with advancing age. She lays more and more sparingly, and no longer deposits her eggs in close and regular order in the cells, but in a scattering, irregular manner. Finally, when the contents of her spermatheca are exhausted, brooding either ceases entirely, or only drones make their appearance. I reserve my remarks on this interesting condition of matters for a future occasion.
PLB
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