The South American rubber plant, from which a
great portion of the caoutchouc of commerce is obtained. There are
several species of siphonia which, equally with the above, furnish
the India rubber exported from Para. The caoutchouc exists in the
tree in the form
of a thin, white milk, which exudes from
incisions made in the trunk, and is poured over molds, which were
formerly shaped like jars, bottles, or shoes, hence often called
bottle rubber. As it dries, the coatings of milky juice are
repeated until the required thickness is obtained, and the clay
mold removed. It belongs to the extensive family _Euphorbiaceae_.
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