Thus the very name of Druidism is a proof of the Celtic addiction to tree-worship, and De Brosses,[10] as a further evidence that this was so, would derive the word kirk, now softened into church, from quercus, an oak; that species having been peculiarly sacred.

Any type of endocrine inferiority, interfering with success in life, may lead to the habit of drug addiction as one way out.