As soon as a worker grub leaves the cell it enters upon its life of labour. It is immature at this point, and as the air-organs, or tracheæ, are not fully developed, it cannot fly. Its first work, therefore, is that of "nurse" to the grubs still in the cells, and to supply the queen with "chyle" food. About a fortnight after leaving the cell, the young bee, if the weather be fine and warm, will venture out of the hive to try its wings, and on early spring days such numbers of them may be seen sporting near the entrance of the hive as to lead a novice to suppose that swarming was about to take place. The bee-keeper of experience, however, while rejoicing at the sight, will know that the exodus is partly due to the fact that some natural or artificial food has entered the hive and that more must be supplied for the needs of the inmates. After the worker's trial flight, she proceeds upon her duties as a food supplier to the community. She has had some experience as a "nurse" in handling pollen, so that at first it seems but natural she should give most attention to that food, and, in cleaning her body from its clinging particles, she finds out the uses of her several organs. In the beginning her loads of pollen are often small, but with experience her carrying capacity soon finds its limit. In time she discovers nectar in the flowers, and as she becomes less able to gather pollen she increases her honey-collecting power. When nectar is abundant bees will often commence their work at sunrise and continue throughout the day until sunset. In such a "honey-flow" the average life of the worker from the time she leaves the cell is seldom more than six or eight weeks, every minute of which is given up to the communal labour. The whole of the work inside the hive depends upon the worker--she is architect, builder, caretaker, nurse, sanitary officer and the rest; there is method in everything she does, so it is inadvisable to interfere unnecessarily with any part of it. She objects strongly to undue interference, to mere curiosity of inquisitive humans. The worker bees are, indeed, wondrous creatures: they are known to have their feelings of friendship and dislike almost human in their intensity; their expressions of sorrow on the loss of their queen or when their stores are failing are as unmistakable as their hum of contentment when the hive is thriving, or the buzz of anger when rudely-disturbed.