Fig. 320.—Portion of the comb, with the eggs occupying the cells. One of the royal cells has been opened by the queen.
The eggs are not long in being hatched. From the moment when the larva comes out of the egg till that of its metamorphosis into a pupa, it keeps in its cell, rolled up, motionless as an Indian idol in its sacred temple. The working bees visit it from time to time, to see that it wants for nothing, and to renew its provisions. They also carefully inspect the different cells, and assure themselves of the good condition of their nurslings. The pap which they give them as food is whitish, and resembles paste made of flour. It is apparently a preparation of pollen, prepared in the body of the insect. As the larvæ increase in size, their food is made to acquire a more decided taste of honey, and to become even slightly acid. It seems, then, that the bees know how to graduate the food of their larvæ in such a manner as to bring it nearer by degrees to honey.
Fig. 321.
Larva of the Bee
(magnified).
In the space of five days the larvæ are developed; they have absorbed all their pap, and have no need from that time of any nourishment, for they are about now to change into pupæ. Now the nurses pay them a last attention. They wall them up in their cells, closing the openings with a waxen covering. The larvæ then get close to the wax covering. In thirty-six hours they have spun for themselves a silky cocoon, in which they undergo their transformation into pupæ. The moult, which precedes their metamorphosis, constitutes a crisis, as with the caterpillars of Lepidoptera.
The perfect insect is hatched seven or eight days after its transformation into a pupa, the organs being developed little by little, and the young bee is then ready to appear in the broad daylight. It breaks through the thin transparent covering in which it is still swathed; then, with its mandibles, it pierces the operculum, or door of its prison, and opens a way for itself by which it can issue forth. With the assistance of its front legs it clings to the rim of the cell, and draws itself forward, till it has set free the whole of its body. The other bees lavish upon this newly-arrived little stranger all possible attention, to make its entrance into the world easy and agreeable; assisting and supporting it till it has become quite strong. It very soon becomes strong. If it is a working bee, it is not long in getting to work and in mixing with its companions in labour.
This is the way in which the hatching of ordinary bees takes place, workers and males; the first, twenty days after they are laid; the second, twenty-four days after. The rearing and birth of the young queens is slightly different. In proportion as the larvæ increase in size do the workers enlarge the cells which contain them; and then again gradually diminish their size as the moment of their last metamorphosis approaches. A special and peculiar food is given to the larvæ of the queens; it is quite different from that which is given to the larvæ of the working bees, being a heavier and sweeter substance. This special food seems to exercise such an energetic influence on the development of the ovaries, that simple workers which have accidentally received any of it, during their larval state, become pregnant and lay a few eggs. But this anomalous development remains imperfect, because the prolific food was only administered in a small quantity. Besides which, the size of the cells is of great importance to the development of the larvæ imprisoned in them; and so the larvæ of working bees, having lived in the small cells, can never attain the proportions of the queen, nor acquire her fecundity. But all this is changed if these larvæ are moved into the large cells and fed on this royal pabulum; they then become veritable queens. If, with us, the coat does not make the man nor the frock the monk, it is certain that with the bees the cradle helps materially to make the queen.