ld on earth, the weight of the water they
displace is increased at the same rate also, and their buoyancy remains
unchanged. If the development of life here so closely follows its
lines on earth, with the exception of comparatively slight
modifications, which are exactly what, had we stopped to think, we
should have expected to find, may we not reasonably ask whether she
will not continue on these lines, and in time produce beings like
ourselves, but with more powerful muscles and eyes capable of seeing
clearly with less light? Reasoning by analogy, we can come to no other
conclusion, unless their advent is anticipated by the arrival of
ready-made colonists from the more advanced earth, like ourselves. In
that case man, by pursuing the same destructive methods that he has
pursued in regard to many other species, may exterminate the
intervening links, and so arrest evolution."

Before leaving Deepwaters Bay they secured a pail of its water, which
they found, on examination, contained a far larger percentage of salt
and solid material than the oceans on earth, while a thermometer that
they immediately immersed in it soon registered eighty-five degrees
Fahrenheit; both of which discoveries confirmed them in what they
already knew, namely, that Jupiter had advanced comparatively little
from the condition in which the water on the surface is hot, in which
state the earth once was.

They were soon beyond the estuary at which they had stopped to study
the forms of life and to make this test, and kept on due north for
several days, occasionally rising above the air. As their familiarity
with their surroundings increased, they made notes of several things.
The mountains covered far more territory at their bases than the
terrestrial mountains, and they were in places very rugged and showed
vast yawning chasms. They were also wooded farther up their sides, and
bore but little snow; but so far the travellers had not found them much
higher than those on earth, the greatest altitude being the thirty-two
thousand feet south of Deepwaters Bay, and one other ridge that was
forty thousand; so that, compared with the size of the planet and its
continents, they seemed quite small, and the continents themselves were
comparatively level. They also noted that spray was blown in vast
sheets, till the ocean for miles was white as milk. The wind often
attained tornado strength, and the whole surface of the water, about
what seemed to be