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ditions. I believe it could be done with a smaller balloon than that with which Zep-
pelin experimented on the Lake of Geneva. A powerful motor, giving several hundred horse-power, would be necessary, but big motors are lighter in proportion than small ones, and a suitable motor could doubtless be made.

For a long journey like that between Eu-
rope and America you would require a power-
ful balloon, capable of resisting a certain amount of rough weather and able to rise and fall easily, so that the aeronaut could seek his own currents. If you rise to a height of 5.000 yards from the ground, you