Some queens appear to die of old age or disease, and at a time when there are no worker-eggs, or larvæ of a suitable age, to enable the bees to supply their loss. It is evident, however, that no very large proportion of the queens which perish, are lost under such circumstances. Either the bees are aware of the approaching end of their aged mother, and take seasonable precautions to rear a successor; or else she dies very suddenly, so as to leave behind her, brood of a suitable age. It is seldom that a queen in a hive that is strong in numbers and stores, dies either at a period of the year when there is no brood from which another can be reared, or when there are no drones to impregnate the one reared in her place. In speaking of the age of bees, it has already been stated that queens commonly die in their fourth year, while none of the workers live to be a year old. Not only is the queen much longer lived than the other bees, but she seems to be possessed of greater tenacity of life, so that when any disease overtakes the colony, she is usually among the last to perish. By a most admirable provision, their death ordinarily takes place under circumstances the most favorable to their bereaved family. If it were otherwise, the number of colonies which would annually perish, would be very much greater than it now is; for as a number of superannuated queens must die every year, many, or even most of them might die at a season when their loss would necessarily involve the ruin of their whole colony. In non-swarming hives, I have found cells in which queens were reared, not to lead out a new swarm, but to supply the place of the old one which had died in the hive. There are a few well authenticated instances, in which a young queen has been matured before the death of the old one, but after she had become quite aged and infirm. Still, there are cases where old queens die, either so suddenly as to leave no young brood behind them, or at a season when there are no drones to impregnate the young queens.