He tugged and tugged until he was red in the face.  Then he beckoned to the two boys, and they came to his aid.  There was barely room for them all to each get one hand on the rock, and then, only after a powerful tug did it come up.  Almost instantly it dropped back to the earth.

“This is remarkable!” the professor said.  “I wonder if the other stones are the same.”

He tried several others, and one and all resisted his efforts.  It was only the small stones he was able to lift alone, and these, he said, were so weighty that it would have been a task to throw them any distance.

“The water and the stones are strangely heavy in this land,” he said.  “I wonder what other queer things we shall see.”

“I saw a bird a little while ago, when I went to pick up that stone,” observed Washington.

“What kind was it?” asked the inventor.

“I don’t know, only it was about as big as an eagle.”

The travelers wandered about a quarter of a mile from the ship.  They avoided the tall grass and the lofty nodding flowers that seemed to grow in regular groves, and kept to places where they could walk with comparative freedom.

“Have you formed any idea, Professor, as to the nature of this country?” asked Mark, who liked to get at the bottom of things.

“I have, but it is only a theory,” Mr. Henderson answered.  “I believe we are on a sort of small earth that is inside the larger one we live on.  This sphere floats in space, just as our earth does, and we have passed through the void that lies between our globe and this interior one.  I think this new earth is about a quarter the size of ours and in some respects the same.  In others it is vastly different.

“But we will not think of those things now.  We must see what our situation is, whether we are in any danger, and must look to repairing our ship.  There will be time enough for other matters later.”

The travelers were walking slowly along, noting the strange things on every side.  As they advanced the vegetation seemed to become more luxuriant, as if nature had tried to out-do herself in providing beautiful flowers and plants.  The changing lights added to the beauty and weirdness of the scene.

The plain was a rolling one, and here and there were small hills and hollows.  As the travelers topped a rise Jack, who was in advance, called out: 

“Oh what queer plants!  They are giant Jacks-in-the-pulpit!”

The others hastened forward to see what the boy had discovered.  Jack was too eager to wait, and pressed on.  The hill which sloped away from the top of the little plateau on which he stood, was steeper than he had counted on.  As he leaned forward he lost his balance and toppled, head foremost, down the declivity, rolling over.

“Look out!” cried Mark, who had almost reached his comrade’s side.

The scene that confronted the travelers was a strange one.  Before them in a sort of hollow, were scores of big plants, shaped somewhat like a Jack-in-the-pulpit, or a big lily, with a curved top or flap to it.