The volcano looked like a walnut shell cut in halves, with its side cut open.
CHAPTER IV.
THE HOLLOW MOUNTAIN.
Certainly the appearance of the volcanic mountain was unusual in the extreme. What did it mean?
Had internal fires burned it out and made of it a hollow cone? It certainly looked very much so.
But now another startling thing was seen. Into the vast cavity a large body of men were seen to be rushing.
“It is the home of the barbarians!” cried Professor Gaston, in amazement. “More and more wonderful!”
The aerial voyagers gazed upon the spectacle in sheerest wonder.
Into the mighty aperture rushed the Antarctic natives. In a few moments not one was in sight.
The airship now rapidly settled down at the foot of the volcano.
There was one resolute purpose in the minds of all.