55).

Contrary to their practice when house building, they have scarcely ever employed the vault or arch in temple architecture.

We nowhere meet with it, except at Deir el Bahari, and in the seven parallel sanctuaries of Abydos.

Even in these instances, the arch is produced by "corbelling"; that is to say, the curve is formed by three or four superimposed horizontal courses of stone, chiselled out to the form required (fig.

56).