"The India-rubber tree is not likely to be mistaken for any other," said their governess, "and it does not look very dark and gloomy in that forest, where everything seems to be crowded close and in a tangle, because South American vegetation grows so thickly and rapidly. This is the country which supplies the largest quantity of India-rubber. Immense cargoes are shipped from the town of Para, on the river Amazon, and obtained from the _Siphonia elastica_."