I cast hasty glances aloft at the suspended vapors, and I seek to penetrate their mighty depths. But the vault above is tranquil. The clouds, which are now elevated to the very summit, appear utterly still and motionless, and completely lost in the irradiation of electric light. It is necessary, therefore, to seek for the cause of this phenomenon elsewhere.
I examine the horizon, now perfectly calm, pure, and free from all haze. Its aspect still remains unchanged. But if this awful noise proceeds from a cataract--if, so to speak in plain English, this vast interior ocean is precipitated into a lower basin--if these tremendous roars are produced by the noise of falling waters, the current would increase in activity, and its increasing swiftness would give me some idea of the extent of the
