The great period of Roman pottery is marked by the ribbing on the outsides.
After setting forth that " building with brick was not only more comely and durable, but also more safe against future perils of fire," it was enacted " that all the outsides of all buildings in and about the city should be made of brick or stone, except doorcases and windowframes, and other parts.
The outsides of the principal doorways and their pointed arches are magnificently enriched with carving and coloured inlay, a curious combination of three styles - Norman-French, Byzantine and Arab.
Of other medieval glass may be noted the splendid glass vases for lamps, with Arab inscriptions fused in colors on the outsides.
The outsides of the ears have a white tip and a broad black mark occupying the greater part of the surface, but are white at the base.