William Lewis Herndon, Lieutenant, U.S.N., Exploration of the Valley of the Amazon… (1853)
“ Though going down hill by the barometer, we were evidently crossing a chain of mountains, which the stream at the bottom of the valley has saved us the trouble of ascending and descending, by cleaving a way through for itself, and leaving the mountains on either hand towering thousands of feet above our heads. The ride was the wildest we have yet had; the road sometimes finding room along the borders of the river, and then ascending nearly to the top of the hills, and diminishing the foaming and thundering stream to a noiseless, silver thread. ”
