The next few days saw Tom busily engaged on the airship, making some changes and a few repairs that were needed. His father, Eradicate and Mr. Jackson helped him. As for Mr. Parker, the scientist, he went about the place, being much interested in the various machines which Tom or Mr. Swift had patented.
At other times the scientist would stroll about the extensive grounds, making what he said were "observations." One afternoon Tom saw him, apparently much excited, kneeling down back of a shed, with his ear to the ground.
"What is the matter?" asked the lad, thinking perhaps Mr. Parker might be ill.
"Have you ever had any earthquakes here, Tom Swift?" asked the scientist, quietly.
"Earthquakes? No. We had enough of them on the island."
"And you are going to have one here, in about two minutes!" cried Mr. Parker. "I predict that this place will be shaken by a tremendous shock very soon. We had all better get away from the vicinity of buildings."
"What makes you think there will be an earthquake?" asked Tom.
"Because I can hear the rumbling beneath the ground at this very minute. It is increasing in volume, showing that the tremors are
