the earth and its satellite.

"We must," said Bearwarden, "be moving at the rate of nearly a
million miles an hour, from the way we have travelled."

"We must be doing fully a million," replied Cortlandt, "for by
this time we are pretty well in motion, having got a tremendous
start when so near the moon, with it and the earth in line."

By steering straight for Jupiter, instead of for the place it
would occupy ten days later, they knew they would swing past, for
the giant planet, being in rapid motion, would advance; but they
did not object to this, since it would give them a chance to
examine their new world in case they wished to do so before
alighting; while, if they preferred to land at once, they could
easily change their course by means of the moons, the fourth,
from which their car was named, being the one that they knew
would be of most use. Their tremendous speed showed them they
should have time for exploration on their arrival, and that they
would reach their destination sooner than they had expected. The
apergetic force being applied, as we have seen, only to the
Callisto, just as power in starting is exerted on a carriage or
railway car and only through it to the passengers, Ayrault and
his companions had no unusual sensation except loss of weight,
for, when they were so far from the earth, its attraction was
very slight, and no other planet was near enough to take its
place. After breakfast, wishing to reach the dome, and realizing
that it would be unnecessary to climb, each in turn gave a slight
spring and was obliged to put up his hands to avoid striking the
roof. In the cool quiet of the dark dome it was difficult to