“Upon this the clay and soil were laid down, and the road does float, for we passed over it at the rate of five and twenty miles an hour, and saw the stagnant swamp water trembling on the surface of the soil on either side of us. I hope you understand me. The embankment had gradually been rising higher and higher, and in one place where the soil was not settled enough to form banks, Stephenson had constructed artificial ones of woodwork, over which the mounds of earth were heaped, for he said that though the woodwork would rot, before it did so the banks of earth which covered it would have been sufficiently consolidated to support the road. We had now come fifteen miles, and stopped where the road traversed a wide and deep valley. Stephenson made me alight and led me down to the bottom of this ravine, over which, in order to keep his road level, he has thrown a magnificent viaduct of nine arches, the middle one of which is seventy feet high, through which we saw the whole of this beautiful little valley. It was lovely and wonderful beyond all words. He here told me many curious things respecting this ravine; how he believed the Mersey had once rolled through it; how the soil had proved so unfavorable for the foundation of his bridge that it was built upon piles, which had been driven into the earth to an enormous depth; how while digging for a foundation he had come to a tree bedded in the earth, fourteen feet below the surface of the ground; how tides are caused, and how another flood might be caused; all of which I have remembered and noted down at much greater length than I can enter upon here. He explained to me the whole construction of the steam engine, and said he could soon make a famous engineer of me, which, considering the wonderful things he has achieved, I dare not say is impossible. His way of explaining himself is peculiar, but very striking, and I understood, without difficulty, all that he said to me. We then rejoined the rest of the party, and the engine having received its supply of water, the carriage was placed behind it, for it cannot turn, and was set off at its utmost speed, thirty-five miles an hour, swifter than a bird flies (for they tried the experiment with a snipe). You cannot conceive what that sensation of cutting the air was; the motion is as smooth as possible, too. I could either have read or written; and as it was, I stood up, and with my bonnet off ‘drank the air before me.’ The wind, which was strong, or perhaps the force of our own thrusting against it, absolutely weighed my eyelids down.