Instantly there was a rush and a whistling sound as of
escaping steam, while in a few moments their barometer stood at
thirty-six inches, whereupon they closed the opening.
"I fancy," said Dr. Cortlandt, "we had better wait now till we
become accustomed to this pressure. I do not believe it will go
much higher, for the window made but little resistance when we
shut it."
Finding they were not inconvenienced by a pressure but little
greater than that of a deep coal-mine, they again opened the
port, whereupon their barometer showed a further rise to
forty-two, and then remained stationary. Finding also that the
chemical composition of the air suited them, and that they had no
difficulty in breathing, the pressure being the same as that
sustained by a diver in fourteen feet of water, they opened a
door and emerged. They knew fairly well what to expect, and were
not disturbed by their new conditions. Though they had
apparently gained a good deal in weight as a result of their
ethereal journey, this did not incommode them; for though
Jupiter's volume is thirteen hundred times that of the earth, on
account of its lesser specific gravity, it has but three hundred
times the mass--i.
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