Commencing at the vaulted roof of the hive, they begin the construction of their cells, and, just as we do in the manufacture of a web, they construct their cells from top to bottom, taking care to leave two passages around each compartment, for the entrance of some and the exit of others. The combs, which are fastened to the hive in the upper part, and in a slight degree also at the sides, adhere to each other, and are thus suspended altogether. They do not touch the floor of the hive, and are either angular or round, according to its shape; sometimes, in fact, they are both angular and round at once, when two swarms are living in unison, but have dissimilar modes of operation. They prop up the combs that are likely to fall, by means of arched pillars, at intervals springing from the floor, so as to leave them a passage for the purpose of effecting repairs. The first three ranks of their cells are generally left empty when constructed; and the last ones, especially, are filled with honey: hence the combs are always taken out at the back of the hive. The bees that are employed in carrying look out for a favorable breeze, and if a gale should happen to spring up, they poise themselves in the air with little stones, by way of ballast; some writers say that they place them upon their shoulders. When the wind is contrary, they fly close to the ground, taking care, however, to keep clear of the brambles. It is wonderful what strict watch is kept upon their work: all instances of idleness are carefully remarked, the offenders are chastised, and on a repetition of the fault, punished with death. Their sense of cleanliness, too, is quite extraordinary; everything is removed that might be in the way, and the rubbish and waste bits made by those that are at work within, is all collected into one spot, and on stormy days, when they are obliged to cease their ordinary labors, they employ themselves in carrying it out. Towards evening, the buzzing in the hive becomes gradually less and less, until at last one of their number is to be seen flying about the hive with the same loud humming noise with which they were aroused in the morning, thereby giving the signal, as it were, to retire to rest: in this, too, they imitate the usage of the camp. The moment the signal is heard, all is silent. They first construct the dwellings of the commonalty, then those of the king-bee. If they have reason to expect an abundant[192] season, they add abodes also for the drones: these are cells of a smaller size, though the drones themselves are larger than the bees.