WHAT ARE RESINS?

Resins are more or less solid, amorphous products with a complex chemical nature.

They are usually contained in SCHIZOGENOUS or SCHIZOLYSIGENOUS DUCTS or CAVITIES. They are often preformed in the plants (i.e. they are normally physiological products) but the yield is usually increased by injury (e.g. in case of pinus).
Many products (e.g. Benzoin and Balsam of Tolu) are not formed by the plant till it has been injured i.e. they are of pathological origin.