However, daily observations revealed a certain change going on
in the state of the ground. About the 15th of August the vapors
ejected had sensibly diminished in intensity and thickness.
Some days afterward the earth exhaled only a slight puff of
smoke, the last breath of the monster enclosed within its circle
of stone. Little by little the belt of heat contracted, until
on the 22nd of August, Barbicane, his colleagues, and the
engineer were enabled to set foot on the iron sheet which lay
level upon the summit of Stones Hill.

"At last!" exclaimed the president of the Gun Club, with an
immense sigh of relief.

The work was resumed the same day. They proceeded at once to
extract the interior mould, for the purpose of clearing out the
boring of the piece. Pickaxes and boring irons were set to work
without intermission. The clayey and sandy soils had acquired
extreme hardness under the action of the heat; but, by the aid
of the machines, the rubbish on being dug out was rapidly carted
away on railway wagons; and such was the ardor of the work, so
persuasive the arguments of Barbicane's dollars, that by the 3rd
of September all traces of the mould had entirely disappeared.

Immediately the operation of boring was commenced; and by the
aid of powerful machines, a few weeks later, the inner surface
of the immense tube had been rendered perfectly cylindrical, and
the bore of the piece had acquired a thorough polish.

At length, on the 22d of September, less than a twelvemonth
after Barbicane's original proposition, the enormous weapon,