e., it would weigh but three hundred times as
much. Further, although a cubic foot of water or anything else
weighs 2.5 as much as on earth, objects near the equator, on
account of Jupiter's rapid rotation, weigh one fifth less than
they do at the poles, by reason of the centrifugal force.
Influenced by this fact, and also because they were 483,000,000
miles from the sun, instead of 92,000,000 as on earth, they had
steered for the northern limit of Jupiter's tropics. And, in
addition to this, they could easily apply the apergetic power in
any degree to themselves when beyond the limits of the Callisto,
and so be attracted to any extent, from twice the pull they
receive from gravitation on earth to almost nothing.
Bearwarden and Ayrault shouldered their rifles, while Dr.
Cortlandt took a repeating shot-gun with No. 4 shot, and, having
also some hunting-knives and a sextant, all three set out in a
northwesterly direction. The ground was rather soft, and a warm
vapor seemed to rise from it. To the east the sky was veiled by
dense clouds of smoke from the towering volcanoes, while on their
left the forest seemed to extend without limit. Clumps of huge
ferns were scattered about, and the ground was covered with
curious tracks.
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