As we advanced, I noticed that the waters were becoming white and foamy, with great briny patches as if a passing steamer had churned up the waves. Gradually these frothy expanses grew wilder and more conspicuous, until the entire river was a seething, effervescent mass; and troubled waves sprang to life, with turbulence that increased as we moved upstream, until the bubbling white was mingled with the green and gray of leaping surges, and the waters were agitated as if by a storm-wind. Yet only the faintest breeze was blowing, and I could not understand the source of the strange commotion. At the some time, a disquieting sound came to my ears--the continuous and droning sound of thunder, dull and muffled but gradually growing louder in spite of the clamoring and roaring of the waves. So deep-toned and voluminous was it that it reminded me of a din I never expected to hear again--the booming of the ocean along resisting shores. All of our party moved without a word now, moved rapidly and with faces straining westward, as if eager for some rare and long-awaited event. In their very speechlessness there was a contagious tension; and, responsive to their mood, I too was expectant, though I could not imagine what there was to be anticipated. But I did not have long to wait. “Look! There it is!” exclaimed one of the party, suddenly. And he paused, and pointed straight ahead; and all his companions paused and pointed straight ahead, joining in his awed cries of “Look! There it is!” Of course, I strained my eyes quite as earnestly as any of them. But at first I saw nothing to impress me. All that was visible was a broad sheet of white looming just above the river for almost its full width, as though there were a falls a mile or two upstream. And, in my ignorance, I accepted this as the explanation. But I was speedily to discover my error. Suddenly the path bent away from the river at an acute angle; and as we followed our new course the distant thundering grew louder--while a cold wind began to sweep over us and the supposed waterfall took on unexpected dimensions. By degrees it lengthened until it seemed a long jet of water shot horizontally out of some colossal hose. Intensely white, with the whiteness of foam and edges blurred with spray, it went hurtling with the impetuosity and swiftness of an arrow from the nozzle of a gigantic pipe, plunging outward hundreds of yards in a graceful parabola and giving rise to the Salty River. Almost as remarkable as this torrent of water was the tube from which it was discharged. This great pipe, which may have been of a steel alloy, was well over a mile long, and was a hundred yards across at the opening; but it narrowed gradually as it crept westward along the ground and disappeared where the green horizon met the earth.