as they rose and blown into white dust on
the surface of the sea. It was manifest that the cyclone was
advancing with fearful velocity straight towards the regions of the
pole.

"Higher!" said Robur.

"Higher it is," said Tom Tumor.

An extreme ascensional power was communicated to the aeronef, and she
shot up slantingly as if she was traveling on a plane sloping
downwards from the southwest. Suddenly the barometer fell more than a
dozen millimeters and the "Albatross" paused in her ascent.

What was the cause of the stoppage? Evidently she was pulled back by
the air; some formidable current had diminished the resistance to the
screws. When a steamer travels upstream more work is got out of her
screw than when the water is running between the blades. The recoil
is then considerable, and may perhaps be as great as the current. It
was thus with the "Albatross" at this moment.

But Robur was not the man to give in. His seventy-four screws,
working perfectly together, were driven at their maximum speed. But
the aeronef could not escape; the attraction of the cyclone was
irresistible. During the few moments of calm she began to ascend, but
the heavy pull soon drew her back, and she sunk like a ship as she
founders.

Evidently if the violence of the cyclone went on increasing the
"Albatross" would be but as a straw caught in one of those whirlwinds
that root up the trees, carry off roofs, and blow down walls.

Robur and Tom could only speak by signs. Uncle Prudent and Phil Evans
clung to the rail and wondered if the cyclone was not playing their
game in destroying the aeronef and with her the inventor--and with
the inventor the secret of his invention.

But if the "Albatross" could not get out of the cyclone vertically
could she not do something else? Could she not gain the center, where
it was comparatively calm, and where they would have more control
over her? Quite so, but to do this she would have to break through
the circular currents which were sweeping her round with them. Had
she sufficient mechanical power to escape through them?

Suddenly the upper part of the cloud fell in. The vapor condensed in
torrents of rain. It was two o'clock in the morning. The barometer,
oscillating over a range of twelve millimeters, had now fallen to
27.91, and from this something should be taken on account of the
height of the aeronef above the level of the sea.

Strange to say, the cyclone was out of the zone to which suc