\'\'introduction:\'\' The Druids used a particular method for communicating and remembering their wealth of treeknowledge. This method is known as the Ogham [pronounced o\'um]. It consisted of twenty-five simple strokes centered on or branching off from a central line. The Ogham characters were inscribed on stones or written on staves of wood. As a method of writing it is laborious; but as a language of symbolism it is powerful.