ARCHĬTECTŪRA (ἀρχιτεκτονία, ἀρχιτεκτονική), architecture. The necessity for a habitation, and the attempt to adorn those habitations which were intended for the gods, are the two causes from which the art derives its existence. In early times little attention was paid to domestic architecture. The resources of the art were lavished upon the temples of the gods; and hence the greater part of the history of Grecian architecture is inseparably connected with that of the temple, and has its proper place under TEMPLUM, and the subordinate headings, such as COLUMNA, &c. But, though the first rise of architecture, as a fine art, is connected with the temple, yet, viewed as the science of construction, it must have been employed, even earlier, for other purposes, such as the erection of fortifications, palaces, treasuries, and other works of utility. Accordingly, it is the general opinion of antiquaries, that the very earliest edifices, of which we have any remains, are the so-called Cyclopean works, in which we see huge unsquared blocks of stone built together in the best way that their shapes would allow. [MURUS.] In addition to these, however, there are other purposes for which architecture, still using the term in its lower sense, would be required in a very early stage of political society; such as the general arrangement of cities, the provision of a place for the transaction of public business, with the necessary edifices appertaining to it [AGORA, FORUM], and the whole class of works which we embrace under the head of civil engineering, such as those for drainage [CLOACA, EMISSARIUS], for communication [VIA, PONS], and for the supply of water [AQUAE DUCTUS]. Almost equally necessary are places devoted to public exercise, health, and amusement, GYMNASIUM, STADIUM, HIPPODROMUS, CIRCUS, BALNEUM, THEATRUM, AMPHITHEATRUM. Lastly, the skill of the architect has been from the earliest times employed to preserve the memory of departed men and past events; and hence we have the various works of monumental and triumphal architecture, which are described under the heads FUNUS, ARCUS, COLUMNA. The history of architecture may be divided into five periods. The first, which is chiefly mythical, comes down to the time of Cypselus, Ol. 30, B.C. 660: the second period comes down to the termination of the Persian war, Ol. 75. 2, B.C. 478: the third is the brilliant period from the end of the Persian war to the death of Alexander the Great, Ol. 114, B.C. 323: the fourth period extends to the battle of Actium, B.C. 31: the fifth period embraces the architecture of the Roman empire till it became mingled with the Gothic. Strongly fortified cities, palaces, and treasuries are the chief works of the earlier part of the first period; and to it may be referred most of the so-called Cyclopean remains; while the era of the Dorian invasion marks, in all probability, the commencement of the Dorian style of temple architecture. In the second period