Lunch having been disposed of, Rawolle, taking out his watch, remarked to Cobb: "In a few minutes we will be directly over Louisville, Kentucky; and in these few minutes, I will briefly explain the effects of the great cataclysm of 1916, as I promised to do: The gas strata of the Ohio basin," he began, "extending from above Pittsburgh to the Mississippi River, with pockets innumerable and ramifications in every direction, contained millions of millions of cubic feet of gas under varying pressures from nil to many atmospheres. The catastrophe at Dillenback's ignited the gas in what appeared to have been the main strata. Explosion followed explosion throughout the region now occupied by the Central Sea. The earth was rent and broken, and the great vacuums, caused by the annihilation of the gases, took away the support of the upper crust, and then atmospheric pressure completed the ruin. The earth sank and crushed into these voids until a new foundation was reached. In some sections the fall of the crust was frightful, terrific. In the vicinity of Cincinnati but one shock was felt, but that shock was terrible, horrible, annihilating. The earth sank 196 feet at one fall. Not a living soul escaped the shock of impact upon the underlying strata. The city was an inconceivable mass of ruins, and in two days, was covered with water. So it was over a region of 100,000 square miles, the earth sinking everywhere, but to different depths and with different rates of depression. Pittsburgh sank 377 feet, but so slowly that few lives were lost, though the destruction of property was very great. At the mouth of the Ohio the earth sank only one foot, increasing toward the east. Millions of lives were sacrificed and untold wealth lost, for the great depression commenced immediately to fill with the waters from the streams flowing into the Ohio basin, and from the underlying strata. Even the Mississippi turned its waters into the old mouth of the Ohio and flowed east, leaving but a small, shallow stream to flow in its old bed until augmented by the streams and rivers emptying into it below Cairo. Even with all these waters it was an insignificant river until it reached the Arkansas and received the mass of water from that river. But in 1918 the river was diverted back to its proper channel; though later on the dam was removed, owing to the rise in the Central Sea, and the natural outlet being at Cairo. This, in brief, Mr. Cobb, is the effect of a single accident in a gun factory, in 1916; though who can tell but that it might have occurred later on from some other cause?" "But did not those who were not injured by the shocks and falling buildings have time to move their effects before the waters overtook them? for, surely, this immense sea did not fill up in a few days," ventured Cobb.