It follows that in the tenth century the majority of dwelling-houses were still only light constructions of wood, which could stand upon the mud without danger of sinking. There were many stone buildings already, however, but like their humbler neighbours they mostly had only one story above the ground floor, with small windows on the outside, and larger ones on the inner court, and all alike were roofed with thatch. It is hard to imagine Venice a thatched city, of all cities in the world; yet the reason of the peculiarity is plain enough. Neither brick nor tiles could be made from the soft mud of the lagoons, a wooden house cannot have a flat roof, and the construction of a vaulted roof upon a stone house requires a greater skill in building than the Venetians then possessed. [Sidenote: _Sagredo._] In building ordinary dwellings, Sagredo tells us that the usual method was to lay down a floor of heavy planks, upon which a thick layer of mortar and small pebbles was spread out and beaten down to a hard surface; upon this again a second layer of cement mixed with pounded bricks was spread, and this was beaten with heavy wooden beaters till it was perfectly hard and even. Precisely the same method is employed to-day in southern Italy; and it was from this beginning that the so-called ‘Venetian pavement’ soon developed. For rich people caused small pieces of coloured marbles, and even of mother-of-pearl, to be set into the cement of the second layer, which was then no longer beaten, but rolled with a ponderous stone roller and then rubbed down with a smooth stone and sand and water, and at last polished to a brilliant surface. To this day the ‘Venetian pavement’ is made in this way in all parts of the world. The Venetians had probably inherited the art directly from the Romans, together with some knowledge of mosaic, which it roughly resembles. The polished floor of the main room was an especial object of pride in the eyes of good housekeepers. The Venetian houses resembled those of the Romans in many respects. A covered portico, surrounding a closed court, gave access to the ‘hall of the fireplace,’ as the principal place of gathering for the family was named, and to the kitchens and offices. The upper story consisted entirely of bedrooms, and had a wide balcony called the ‘liago’--a word corrupted from the Greek _heliacon_, ‘a place of sunshine.’ Here in warm weather the family spent the evening. Higher still, a rustic wooden platform was built over a part of the gabled and thatched roof, and was called the ‘altana.’ It was here that the linen was dried after washing, and later, in Titian’s day, it was here that the Venetian ladies exposed their hair to the sun after moistening it with the fashionable dye. [Sidenote: _Mut. Costumi._]