The Carpathians separate Hungary and Transylvania from Lower Austria, Moravia, Silesia, Galicia, Bukovina and Rumania, while its ramifications fill the whole northern part of Hungary, and form the quadrangular mass of the Transylvanian plateau.
The plan here too was roughly quadrangular with a central court, but owing to the erosion of the hillside a good deal of the eastern quarter has disappeared.
The castle is a quadrangular structure of great strength, with rounded towers at three of the angles, and has a circumference of about 400 ft.
Its noteworthy public buildings are the custom-house and its storehouses which occupy the old quadrangular fortress built by the Spanish government between 1770 and 1775, and cover 15 acres, the prefecture, the military and naval offices and barracks, the post-office, three Catholic churches, a hospital, market, three clubs and some modern commercial houses.
Another very singular form is A, laminirostris, which has affixed on either side of the maxilla, near the base, a quadrangular ivory-like plate, forming a feature unique in this or almost in any family of birds.
Strikingly similar in design and construction is a large quadrangular building, the foundations of which were discovered by the British School near the presumed Cynosarges; this may perhaps be the Gymnasium of Hadrian, which Pausanias tells us also possessed ioo columns.
Some of the Italian terremare show quadrangular constructions made like the modern log houses, of undressed tree trunks superposed longitudinally and overlapping at the ends, as at Castione in the province of Parma.
The quadrangular mouth is seen in the centre; the outline of the stomach wall, seen by transparency around it, is nipped in four places interradially to form the four gastric ridges.
Where it is hard and jointed, weathering into large quadrangular blocks, the hills are more especially distinguished for the gnarled bossy character of their declivities, as may be seen in Ben Ledi and the heights to the north-east of it.
There are grammar, model and industrial schools, the first with exhibitions to Trinity College, Dublin; but the principal educational establishment is University College, a quadrangular building in Tudor Gothic style, of grey limestone.