nished
them.

Engineer Serko does not display the least anxiety or impatience. He
continues to greet me with his accustomed ironical cordiality, and
with a kindly air that I distrust--with good reason. He affects to be
solicitous as to my health, urges me to make the best of a bad job,
calls me Ali Baba, assures me that there is not, in the whole world,
such an enchanting spot as this Arabian Nights cavern, observes that I
am fed, warmed, lodged, and clothed, that I have no taxes to pay, and
that even the inhabitants of the favored principality of Monaco do not
enjoy an existence more free from care.

Sometimes this ironical verbiage brings the blood to my face, and I
am tempted to seize this cynical banterer by the throat and choke the
life out of him. They would kill me afterwards. Still, what would that
matter! Would it not be better to end in this way than to spend years
and years amid these infernal and infamous surroundings? However,
while there is life there is hope, I reflect, and this thought
restrains me.

I have scarcely set eyes upon Thomas Roch since the _Ebba_ went away.
He shuts himself up in his laboratory and works unceasingly. If he
utilizes all the substances placed at his disposition there will be
enough to blow up Back Cup and the whole Bermudan archipelago with it!

I cling to the hope that he will never consent to give up the secret
of his deflagrator, and that Engineer Serko's efforts to acquire it
will remain futile.

_September 3_.--To-day I have been able to witness with my own eyes
the power of Roch's explosive, and also the manner in which the
fulgurator is employed.

During the morning the men began to pierce the passage through the
wall of the cavern at the spot fixed upon by Engineer Serko, who
superintended the work in person. The work began at the base, where
the rock is as hard as granite. To have continued it with pickaxes
would have entailed long and arduous labor, inasmuch as the wall at
this place is not less than from twenty to thirty yards in thickness,
but thanks to Roch's fulgurator the passage will be completed easily
and rapidly.

I may well be astonished at what I have seen. The pickaxes hardly made
any impression on the rock, but its disaggregation was effected with
really remarkable facility by means of the fulgurator.

A few grains of this explosive shattered the rocky mass and reduced it
to almost impalpable powder that one's breath could disperse as easily
a