"I wonder what makes so many of them?" asked Mrs. Nestor, with a nervous shiver.
"Yes, indeed, they are terrifying! One never knows when to expect them," added Mrs. Anderson.
"I have a theory about them," said Mr. Parker, the scientist, who, up to this time had spoken but little.
"A theory?" inquired Tom.
"Yes. This island is one of the smaller of the West Indies group. It is little known, and has seldom been visited, I believe. But I am sure that what causes the earthquakes is that the whole island has been undermined by the sea, and it is the wash of great submarine waves and currents which cause the tremors."
"Undermined by the sea?" repeated Tom.
"Yes. It is being slowly washed away."
"Bless my soul! Washed away!" gasped Mr. Damon.
"And, in the course of a comparatively short time, it will sink," went on the scientist, as cheerfully as though he was a professor propounding some problem to his class.
"Sink!" ejaculated Mrs. Nestor. "The whole island undermined! Oh, what an alarming theory!"
"I wish I could hold to a different one,
