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"

"But then," continued Captain Bennet, "in order to reach them,
you must keep constantly ascending or descending. That is the
real difficulty, doctor."

"And why, my dear captain?"

"Let us understand one another. It would be a difficulty
and an obstacle only for long journeys, and not for
short aerial excursions."

"And why so, if you please?"

"Because you can ascend only by throwing out ballast;
you can descend only after letting off gas, and by these
processes your ballast and your gas are soon exhausted."

"My dear sir, that's the whole question. There is the
only difficulty that science need now seek to overcome.
The problem is not how to guide the balloon, but how to
take it up and down without expending the gas which is
its strength, its life-blood, its soul, if I may use the
expression."

"You are right, my dear doctor; but this problem is
not yet solved; this means has not yet been discovered."

"I beg your pardon, it HAS been discovered."

"By whom?"

"By me!"

"By you?"

"You may readily believe that otherwise I should not
have risked this expedition across Africa in a balloon. In
twenty-four hours I should have been without gas!"

"But you said nothing about that in England?"

"No! I did not want to have myself overhauled in
public. I saw no use in that. I made my preparatory
experiments in secret and was satisfied. I have no occasion,
then, to learn any thing more from them."

"Well! doctor, would it be proper to ask what is
your secret?"

"Here it is, gentlemen--the simplest thing in the
world!"

The attention of his auditory was now directed to the
doctor in the utmost degree as he quietly proceeded with
his explanation.



CHAPTER TENTH.

Former Experiments.--The Doctor's Five Receptacles.--The Gas Cylinder.--
The Calorifere.--The System of Manoeuvring.--Success certain.

"The attempt has often been made, gentlemen," said
the doctor, "to rise and descend at will, without losing
ballast or gas from the balloon. A French aeronaut, M.
Meunier, tried to accomplish this by compressing air in an
inner receptacle. A Belgian, Dr. Van Hecke, by means
of wings and paddles, obtained a vertical power that would
have sufficed in most cases, but the practical results

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