Traditions and Hearthside Stories of West Cornwall, Vol. 2, by William Bottrell, , at sacred-texts.com
Antiquaries are undecided with respect to the purpose for which these mysterious stones were erected. Some hold that it is a sepulchral monument, as well as the Men Scryfa (inscribed stone) half a mile further on, because there is a tradition that a little below, in Gendhal moor, there was once so great a battle that the streams ran with blood. Others think the object of its erection was for the computation of time among the latter is Professor Max Müller who, in the Quarterly Review, for August, 1867, after stating that the three stones are in a line bearing nearly east and west, says:—
"This Men-an-tol may be an old dial, erected originally to fix the proper time for the celebration of the autumnal equinox,
and, though it may have been applied to other purposes likewise, such as the curing of children by dragging them several times through the hole, still its original intention may have been astronomical."
He also thinks that the Men-heeres (long stones) served the same purpose, as they are mostly found in pairs bearing nearly east and west.
The Tolmen, in Constantine parish, and holed stones in other parts of the county, were used the same way as Lanyon Crickstone for curing various ailments.
To cure boils and rheumatism, persons "crame" nine times against the sun, under a bramble-growing at both ends.
The notion is that going against the sun will backen a disease but in all other cases the sun's course must be followed.