It stops short at the horny covering, simply because it is checked by an uneatable substance.
From this aversion a little miracle arises; but the insect has no sense of logic; it is passively obedient to the superior logic of facts.

It obeys its instinct, as unconscious of its act as is a crystal when it assembles, in exquisite order, its battalions of atoms.
Sooner or later during the month of August we see a shadowy circle form on each inhabited pea; but only one on each seed.

These circles of shadow mark the doors of exit.

Most of them open in September.

The lid, as though cut out with a punch, detaches itself cleanly and falls to the ground, leaving the orifice free.