Note: Resins exude from trees in combination with essential
oils, gums, etc., and in a liquid or semiliquid state.
They are composed of carbon, hydrogen, and oxygen, and
are supposed to be formed by the oxidation of the
essential oils. Copal, mastic, quaiacum, and colophony
or pine resin, are some of them. When mixed with gum,
they form the gum resins, like asafetida and gamboge;
mixed with essential oils, they frorm balsams, or
oleoresins.
{Highgate resin} (Min.), a fossil resin resembling copal,
occuring in blue clay at Highgate, near London.
{Resin bush} (Bot.), a low composite shrub ({Euryops
speciosissimus}) of South Africa, having smooth pinnately
parted leaves and abounding in resin.