CRUBAN STONE.
The Cruban Stone (Clach a Chrùbain) cured diseases in the joints. It is said by Pennant to have been that species of fossil-shell called gryphite. Its name is from crùban, a sitting, or squatting, or crouching attitude in man or beast, the result of a disease in the feet that makes them unable to stand. A stone of this kind in Breadalbane was lent only under a pledge of two cows (an geall càraid cruidh). If the stone was not returned the cows were to be forfeited.