Lardner Gibbon, Lieutenant, U.S.N., Exploration of the Valley of the Amazon… (1854)
“ The canoe came back for us, and we embarked at the foot of the Andes on a voyage across a stream, which was not navigable, even for a canoe, except where we passed. The color of the water was milky. We met another train of mules, loaded with cacao, on their way to Cochabamba. The Indians transported them over the same way they did us. Our mules were so much exhausted that they stood upon the rocky beach hanging their heads. As the water, dripped from their sides the hot sun dried them, and the swarms of sand-flies troubled them as much as us. ”
