The worker-bee, as we see her in the hive to-day, although evolution must have been busy through the ages determining her present mind-power and bodily conformation, is nevertheless as much a product of direct artifice as she is of original nature. We have seen how the egg containing the feminine germ, if given full scope and opportunity, develops into what may be taken as the complete aboriginal type of female bee, differing from the worker in a dozen essential ways. The queen also is probably, in one respect at least—her amazing fecundity—a deliberate creation of the hive-people, as her over-production is brought about by over-stimulation to meet an artificial state of affairs. Left to herself, under pristine conditions, she would certainly lay on a much more moderate scale. But the worker-bee owes her unique structure and mental constitution almost entirely to the intervention of her nurses from the moment of the hatching of the egg. Careful experiment has proved that the queen-larva and the worker-larva are identical up to the third day of their life in the cell, except that the queen has made more rapid growth owing to more generous and more ample fare. After the third day, the genital system of each larva will begin to develop, if this rich nitrogenous diet is maintained. In the case of the queen, this pre-digested food, well called bee-milk, is lavished on the favoured grub up to the last moment of its larval existence, no other food being given. But in the case of the worker-grub, not only has its supply of bee-milk been restricted in both quantity and quality from the day of its birth, but now—just before the development of the ovaries might be expected—an important change is made. The allowance of bee milk is greatly reduced, while plain honey is given in addition, but on the same parsimonious scale, to the end of its five days’ larval life.