... gneiss, forms several cascades surrounded with thick vegetation. The path leading to the spring is so steep that we could touch with our hands the tops of the arborescent ferns, the trunks of which reach a height of more than twenty-five feet. The surrounding rocks are covered with jungermannias and hypnoid mosses. The torrent, formed by the spring, and shaded with heliconias, uncovers, as it falls, the roots of the plumerias,* (* The red jasmine-tree, frangipanier of the French West India Islands. The plumeria, so common in the gardens of the Indians, has been very seldom found ... — Equinoctial Regions of America • Alexander von Humboldt