"Mammalia?" exclaimed one of the members.

"Yes! Mammalia! The bat, which flies, if I am not mistaken! Is the
gentleman unaware that this flyer is a mammal? Did he ever see an
omelette made of bat's eggs?"

The interrupter reserved himself for future interruption, and Robur
resumed: "But does that mean that man is to give up the conquest of
the air, and the transformation of the domestic and political manners
of the old world, by the use of this admirable means of locomotion?
By no means. As he has become master of the seas with the ship, by
the oar, the sail, the wheel and the screw, so shall he become master
of atmospherical space by apparatus heavier than the air--for it
must be heavier to be stronger than the air!"

And then the assembly exploded. What a broadside of yells escaped
from all these mouths, aimed at Robur like the muzzles of so many
guns! Was not this hurling a declaration of war into the very camp of
the balloonists? Was not this a stirring up of strife between 'the
lighter" and 'the heavier" than air?

Robur did not even frown. With folded arms he waited bravely till
silence was obtained.

By a gesture Uncle Prudent ordered the firing to cease.

"Yes," continued Robur, "the future is for the flying machine. The
air affords a solid fulcrum. If you will give a column of air an
ascensional movement of forty-five meters a second, a man can support
himself on the top of it if the soles of his boots have a superficies