Fig. 4. Alignment of Kermario.

which states that it was struck by lightning, overthrown and broken in the sixteenth century. There is apparently little doubt that once this immense stone stood vertically, but the engineering problem of its erection is not easily solved. One can hardly believe, with Le Rouzic, that the lever and inclined plane were sufficient; yet what other mechanical aids could have been available?

Fig. 5. Menhir Groach or grand menhir. Locmariaquer.