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The authors also found a significant relationship between 35 domesticated tree species—including Brazil nut, �ʲ���á rubber tree, murumuru, and cacao—and the probability of earthworks.

The �ʲ���á rubber tree, originally from Brazil, now occupies huge swathes of southeast Asia, providing the latex necessary to make the tires, belts, O-rings and gaskets that invisibly maintain industrial civilization.

Special features is a "belly" of Para rubber in lieu of a ballonet.

These moulds are made of Pure Para Rubber and will, with proper usage last from twelve to fifteen years, judging from those which have been in use for the past four years.

More than half of all that is brought to market is produced in the valley of the Amazon River; and some of this "Para rubber," as it is called, from the seaport whence it is shipped, is the best in the world.