At a height of some twelve millimetres (About half an inch .-- Translator's Note.), a partition is fixed.

This gives a second storey, which in its turn receives provisions and an egg, the second in order of primogeniture.
And so it goes on, storey by storey, until the cylinder is full.

Then the thick plug of the same green material of which the partitions are formed closes the home and keeps out marauders.
In this common cradle, the chronological order of births is perfectly clear.

The first-born of the family is at the bottom of the series; the last-born is at the top, near the closed door.

The others follow from bottom to top in the same order in which they followed in point of time.