The Logan Stone on the Rhinns of Kells in Galloway, Scotland by Francis Grose (1731-1791)

Caractacus

Thither, youths,
Turn your astonish'd eyes; behold yon huge
And unhewn sphere of living adamant,
Which, poised by magic, rests its central weight
On yonder pointed rock: firm as it seems,
Such is the strange and virtuous property,
It moves obsequious to the gentlest touch
Of him whose breast is pure; but to a traitor,
Tho’ ev’n a giant’s prowess nerv’d his arm,
It stands as fixt as Snowdon.

William Mason (1724–1797)