“There is a healing well on an island in Loch Maree, which was used for curing lunacy as late as the nineteenth century. Coins and nails, as well as pieces of cloth and rag, were hammered into the trunk of a nearby oak tree. Oak trees were believed to be sacred, and may have reflected a pre-Christian belief.
Loch Maree, one of the most beautiful lochs in Scotland, is also the site of a chapel and remains of a burial ground, which are believed to have been founded by St. Maelrubha, although there also appear to have been older pagan traditions associated with the site. Bulls were sacrificed here, as they were at Applecross, and later the custom was associated with St. Maelrubha’s day, 21 April.”
Joyce Miller.
Magic And Witchcraft in Scotland.