The bricks are of the ordinary shape, and not intended for vaulting.

They are laid side by side up to a certain point, being bent into a slight arch by the interposition between them of thin wedges of mortar.

The two sides of the arch having been in this way carried up to a point where the lower extremities of the two innermost bricks nearly touched, while a considerable space remained between their upper extremities instead of a key-stone, or a key-brick fitting the aperture, ordinary bricks were placed in it longitudinally, and so the space was filled in.
[Illustration: PLATE 59] Another mode of constructing a pointed arch seems to be intended in a bas-relief, whereof a representation has been already given.

The masonry of the arcade in No.

V.[PLATE XLIX., Fig.