The Witchcraft Stone - Clach na Buidseach - Strathtay, Perthshire PSAS 1920-21 p38 - This is the name given to a large cup marked boulder built into a dry stone wall on Tullypowrie farm. No tradition was noted regarding how the stone came by this name, although local opinion was that the stone was a cresset to hold lamps for monks attending midnight services.