CYZICUM MARMOR, a species of marble, so called by the ancients, from the great use made of it by a statuary named Cyzicus. It was white, with fine narrow veins of black, and was also called proconnessium.
DADO (an Italian word, signifying a die), a term for the die or plain face of a pedestal ; that part of a room com prehended between the base and surbase. The dado employed in the interiors of buildings, is a continuous pedestal, with a plinth and base mouliHng, and a cornice or dado moulding surmounting the die. This continuous pedestal \With its mould ing is sometimes only made of stucco or plaster ; but in well fmishod rooms is constructed of wood, and is usually about the height of the back of a chair. Its present purpose, when em ployed, is to protect the stucco-work or paper of the walls, but originally it was used as an architectural decoration to a room.
The dado is made of deal boards, glued edge to edge, the heading joints ploughed and tongued together, and the back keyed ; the stuff generally employed for this purpose is whole deal ; the keys are always made to taper in their breadth, and may be about three inches broad in the middle ; they are let into the back of the dado by a transverse groove, hich is either wider at the bottom than at the surface, or it is first made of a square section, which is again grooved on each side next to the bottom. Though the keys should
shrink, those of this last form will always keep their inner surthee close to the bottom of the grooves.
Some workmen prefer the broad end of the key to be placed downwards ; the lower end should rest firmly, either upon the ground or floor, and the dodo should be left at liberty to slide downwards upon the keys. Others, again, prefer the wide end of the key to be placed upwards, and the dado to be fixed by this ; the key, as it shrinks, will fall down from its own weight.
The dado should be grooved and tongued at the internal angles, and mitred, or made with a lap and mitre, at the external ones.
The dado is also framed with panels, but this mode is seldom seen in London ; it is, however, very frequently so prepared in the country.