ltered. Hence he persisted in crowding northward.

But, September 8, an impenetrable, continuous mass of ice lay between
him and the north; the temperature fell to 10 degrees. Hatteras, with
an anxious heart, in vain sought for a passage, risking his ship a
hundred times and escaping from his perils with wonderful skill. He
might have been accused of imprudence, recklessness, folly, blindness,
but he was one of the best of sailors.

The situation of the _Forward_ became really dangerous; in fact, the
sea was closing behind her, and in a few hours the ice grew so hard
that men could run upon it and tow the brig in perfect safety.

Hatteras, not being able to get around this obstacle, determined to
attack it boldly in front. He made use of his strongest blasting
cylinders, containing eight or ten pounds of powder. The men would dig
a hole in the broadest part of the ice, close the orifice with snow,
after having placed the cylinder in a horizontal position, so that a
greater extent of ice might be exposed to the explosion; then a fuse
was lighted, which was protected by a gutta-percha tube.

In this way they tried to break the ice; it was impossible to saw it,
for the fissures would close immediately. Still, Hatteras was hoping
to get through the next day.

But during the night the wind blew a gale; the sea raised the crust of
ice, and the terrified pilot was heard shouting,--

"Look out there aft, look out there aft!"

Hatteras turned his eyes in that direction, and what he saw in the dim
light was indeed alarming.

A great mass of ice, drifting northward with the tide, was rushing
towards the brig with the speed of an avalanche.

"All hands on deck!" shouted the captain.

This floating mountain was hardly half a mile away; the ice was all in
confusion and crashing together like huge grains of sand before a
violent tempest; the air was filled with a terrible noise.

"That, Doctor," said Johnson, "is one of the greatest perils we have
yet met with."

"Yes," answered the doctor, quietly; "it is terrible enough."

"A real attack which we must repel," resumed the boatswain.

"In fact, one might well think it was an immense crowd of antediluvian
animals, such as might have lived near the Pole. How they hurry on, as
if they were racing!"

"Besides," added Johnson, "some carry sharp lances, of which you had
better take care, Doctor."

"It's a real siege," shouted the doctor. "Well, let us run to the
ramparts