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VOLATILE OILS. Volatile or essential oils are volatile in steam.They differ entirely in both chemical and physical properties from fixed oils.They are secreted in: oil cells e.g. CinnamonOil glands e.g. CloveSecretion ducts (vittae) e.g. AniseGlandular hairs e. g. ChamomileThey are frequently associated with other substances such as gums ( oleo gum) and resins (oleoresin) or both (oleo gum resin) They tend to resinify on exposure to air..

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