Possible Clues:

• Mark put on one tree or another
• Type of wood
• Fragrant resinous substance
• Healing ointment made from a resinous substance
• A fragrant medicinal gum
• Fragrant medicinal gum from tree
• Healing agent always incorporated in herbal samples
• Aromatic, oily substance, such as the kind used in vinegars
• Soothing ointment
• How soothing that laboratory Mother has turns out to be!