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The method of building employed in their erection, was generally that mentioned by Vitruvius, in whose time it originated, as 'opus reticulatum'. This was considered by some architects of antiquity a perishable mode of construction; and Vitruvius asserts that some buildings where he had seen it used, had fallen down.

That the Romans had fortified this height there is the strongest evidence in the fact that the substructure of the rampart that once surrounded the castle is of cubic stones laid together according to the method so much practised by the Romans, and known as opus reticulatum.

On the other hand, in the opus incertum, the rubble, lying in courses and imbricated, makes a wall which, though not beautiful, is stronger than the reticulatum. Both kinds should be constructed of the smallest stones, so that the walls, being thoroughly puddled with the mortar, which is made of lime and sand, may hold together longer.

The surface of the concrete is covered with small cubical blocks of stone placed so that their diagonals are horizontal and vertical, and forming what is known as opus reticulatum.

Beyond this point there is nothing of any special interest to arrest our attention, till we come to a considerable mass of ruins, consisting of broken Doric columns of peperino, part of a rough mosaic floor and brick pavement, and fragments of walls lined with tufa squares in the opus reticulatum pattern.

Flowers sweetly scented, white, and in broad corymbs, the feathery appearance of the long, projecting stamens, each tipped with a golden anther, adding considerably to the beauty of the flowers. V. RETICULATUM and V. LAEVIGATUM are rarely seen species, but of interest botanically, if not for floral beauty. V. TINUS. Laurustinus. South Europe, 1596.

Brick was also largely employed in the construction of the foundations and inner walls of public buildings, being arranged at a later date into ornamental patterns, to which the names of opus incertum and opus reticulatum were given; and in the manufacture of this substance, which they were probably at first taught by the Etruscan artificers of Veii in the neighbourhood, the Romans reached a high degree of perfection.

At frequent intervals, facing the road, you see with mournful interest the exposed interiors of tombs, showing that beautiful and curious opus reticulatum, or reticulated arrangement of bricks or tufa blocks, which is so characteristic of the imperial period, and rows upon rows of neat pigeon-holes in the brickwork, which contained the cinerary urns, all robbed of their treasures, their tear-bottles, and even their bones.

Moscioni There are two styles of walls: "opus reticulatum," now used by everybody, and the ancient style called "opus incertum." Of these, the reticulatum looks better, but its construction makes it likely to crack, because its beds and builds spread out in every direction.

Padua crowns the landscape, with its towers and cupolas rising from a continued grove; and, from the drawings I have seen, I should conjecture that Damascus presents somewhat of a similar appearance. Taking our eyes off this extensive prospect, we turned them to the fragments beneath our feet. The walls appear plainly composed of the opus reticulatum so universal in the environs of Naples.