This number was gradually increased with the introduction of the Roman form, and the arrangement was also altered to harmonize with it.

The Ogham alphabet consists of lines, which represent letters.

They are arranged in an arbitrary manner to the right or left of a stemline, or on the edge of the material on which they are traced.
Even the names of those letters, _fleasg_ (a tree), seem an indication of their origin.

A cross has been found, sculptured more or less rudely, upon many of these ancient monuments; and this has been supposed by some antiquarians to indicate their Christian origin.

Doubtless the practice of erecting pillar-stones, and writing Oghams thereon, was continued after the introduction of Christianity; but this by no means indicates their origin.