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Oleoresinous exudations that seem when the trunk of a tree is injured stop lack of sap and act as a protecting seal against parasites and disease organisms. Few essential oils are concerned in plant metabolism, and a few investigators preserve that many of those materials are merely waste products of plant biosynthesis. Younger plants produce more oil than older ones, but old vegetation are richer in additional resinous and darker oils due to the continuing evaporation of the lighter fractions of the oil. A fresh, eucalyptus-like oil used for centuries as a rem