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His hunger to see them became for the minute more insistent than that for food. They represented that human society from which he had waked one morning to find himself cut off, as a rock is cut off by seismic convulsion from the mainland of which it has formed a part.

It is in maritime regions, accordingly, that the inner strata of the earth succumb most readily to those sudden changes in the gravity-levity tension wherein we have recognized the origin of seismic occurrences. Turning to the gaseous condition, we realize that although even here matter retains traces of a connexion with terrestrial gravity, levity is now the dominant factor.

For there are no rocking-chairs in Triana, as there were none in our backwoods, and the little maids tilted to and fro on the fore legs and hind legs of their chairs and lulled their charges to sleep with seismic joltings.

The new advance of the sea was arrested! There could be no question of that, for too many had anxiously noted the points to which the water had attained. We have said that Professor Pludder was puzzled. He was seeking, in his mind, a connection between the seismic tremors and the cessation of the advance of the sea. Inasmuch as the downpour continued, the flood ought still to rise.

At first, it was suggested that the trouble was due to seismic forces, to some volcanic action beneath the lake; but this hypothesis had to be rejected when it was recognized that the disturbance was not confined to one locality, but spread itself over the entire surface of the lake, either at one part or another, in the center or along the edges, traveling along almost in a regular line and in a way to exclude entirely all idea of earthquake or volcanic action.

"Never before have I been in a position to study seismic disturbances so closely. I only regret I have not with me here the instruments I brought in the Snowbird. And we must somehow learn the location of that volcano which is in eruption." "It's all right to learn the location of it," whispered Mark to Jack.

In the pantry he lifted the trap-door, and descended still further into the vaults beneath the house. Ah, the vaults, the long, the tortuous, the darksome vaults, how had I forgotten them? Still I followed, rent by seismic shocks of terror. I had not forgotten the weapon: could I creep near enough, I felt that I might plunge it into the marrow of his back.

This movement to and fro, with crashing and screaming inside and outside the house, continued, as it seemed to me, about twenty minutes as a matter of fact, it lasted hardly seven seconds; but certainly it was the longest seven seconds I have ever known. At the first uplift of the seismic wave my wife and I rose from our seats, I saying, "Stand perfectly still."

Professor Henderson, however, displayed naught but the keenest interest in the scientific side of the happening. He clambered to his feet the moment he could stand, and observed: "A most pronounced seismic disturbance I should say earthquake." "I should say it was pronounced!" grunted Phineas Roebach. Being a fat man, he had fallen heavily.

What the seismic force began the flood of liberated water helped to finish, and there was born the greatest natural wonder of the known world. There are canons all over Arizona and the southwest that resemble the Grand Canon, except that they were made on a smaller scale. Many of them are perfectly dry and apparently never contained any running water.