oused all
the treasures of the island. The products of the colony were there,
methodically arranged, and in a safe place, as may be believed,
sheltered as much from animals as from man.

There was no fear of damp in the middle of that thick mass of granite.
Many natural excavations situated in the upper passage were enlarged
either by pick-axe or mine, and Granite House thus became a general
warehouse, containing all the provisions, arms, tools, and spare
utensils--in a word, all the stores of the colony.

As to the guns obtained from the brig, they were pretty pieces of
ordnance, which, at Pencroft's entreaty, were hoisted by means of tackle
and pulleys, right up into Granite House; embrasures were made between
the windows, and the shining muzzles of the guns could soon be seen
through the granite cliff. From this height they commanded all Union
Bay. It was like a little Gibraltar, and any vessel anchored off the
islet would inevitably be exposed to the fire of this aerial battery.

"Captain," said Pencroft one day, it was the 8th of November, "now that
our fortifications are finished, it would be a good thing if we tried
the range of our guns."

"Do you think that is useful?" asked the engineer.

"It is more than useful, it is necessary! Without that how are we to
know to what distance we can send one of those pretty shot with which we
are provided?"

"Try them, Pencroft," replied the engineer. "However, I think that in
making the experiment, we ought to employ, not the ordinary powder,
the supply of which, I think, should remain untouched, but the pyroxyle
which will never fail us."

"Can the cannon support the shock of the pyroxyle?" asked the reporter,
who was not less anxious than Pencroft to try the artillery of Granite
House.

"I believe so. However," added the engineer, "we will be prudent." The
engineer was right in thinking that the guns were of excellent make.
Made of forged steel, and breech-loaders, they ought consequently to be
able to bear a considerable charge, and also have an enormous range.
In fact, as regards practical effect, the transit described by the ball
ought to be as extended as possible, and this tension could only be
obtained under the condition that the projectile should be impelled with
a very great initial velocity.

"Now," said Harding to his companions, "the initial velocity is in
proportion to the quantity of powder used. In the fabrication of
these pieces, everything dep