We then proceeded to the caoutchouc-tree, and here I determined to rest awhile, to collect some of the valuable gum.
"The Swiss Family Robinson; or Adventures in a Desert Island" by Johann David Wyss
How is the Caoutchouc obtained from the Tree?
"A Catechism of Familiar Things; Their History, and the Events Which Led to Their Discovery" by Benziger Brothers
When Columbus discovered Santo Domingo he found the natives playing with balls made from the gum of the caoutchouc tree.
"Creative Chemistry" by Edwin E. Slosson