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 Arizona. Here there are vast numbers of water-rolled logs of silicified wood, in rocks of Triassic age, but only a small quantity of the wood is fine enough for ornamental purposes. The cellular tissue of the vegetable matter is filled, or even replaced, by various siliceous minerals like chalcedony, jasper, crystalline quartz and semi-opal, the silica having probably been introduced by thermal waters. Some of the agate shows the microscopic structure of araucarian wood. The agatized wood is sometimes known by the Indian name of shinarump.

In India agates occur abundantly in the amygdaloidal varieties of the Deccan and Rájmahàl traps, and as pebbles in the detritus derived from these rocks. Some of the finest are found in the agate-gravels near Ratanpur, in Rájpipla. The trade in agates has been carried on from early times at Cambay, where the stones are cut and polished. Agates are also worked at Jubbulpore.

In many parts of New South Wales, agates, resulting from the disintegration of trap rocks, are common in the river-beds and old drifts. They occur also in Queensland, as at Agate Creek, running into the Gilbert river. South Africa likewise yields numerous agates, especially in the gravels of the Orange and Vaal rivers.

It should be noted that in England agates are found not only in old lavas, like the andesites of the Cheviots, but also to a limited extent in the Dolomitic Conglomerate, an old beach-deposit of Triassic age in the Mendips and the neighbourhood of Bristol. They are also found as weathered pebbles in the drift of Lichfield in Staffordshire.

AGATHA, SAINT, the patron saint of Catania, Sicily, where her festival is celebrated on the 5th of February. The legend is that she was a native of Sicily (probably of Catania, though Palermo also claims her), of noble birth and great beauty. She repelled the advances of the Roman prefect sent by the emperor Decius to govern Sicily, and was by his orders brutally tortured and finally sent to the stake. As soon as the fire was lighted, an earthquake occurred, and the people insisted on her release. She died in prison on the 5th of February 251. The rescue of Catania from fire during an eruption of Mount Etna was later attributed to St Agatha’s veil.

AGATHANGELUS, or, Armenian historian, lived during the 4th century, and wrote a History of the Reign of Dertad, or Tiridates, and of the Preaching of St Gregory the Illuminator. The text of this history has been considerably altered, but it has always been in high favour with the Armenians. It has been translated into several languages, and Greek and Latin translations are found in the Acta Sanctorum Bollandistarum, tome viii. As known to us the history consists of three parts, a history of St Gregory and his companions, the doctrine of Gregory, and the conversion of Armenia to Christianity.

AGATHARCHIDES, or, of Cnidus, Greek historian and geographer, lived in the time of Ptolemy Philometor (181–146 ) and his successors. Amongst other works, he wrote treatises on Asia, Europe and The Red Sea. Interesting extracts from the last, of some length, are preserved in Photius (cod. 213), who praises the style of the author, which was modelled on that of Thucydides.

AGATHARCHUS, an Athenian painter of the 5th century He is said by Vitruvius to have been the first to paint a scene for the acting of tragedies. Hence some writers, such as Karl Woermann, have supposed that he introduced perspective and illusion into painting. This is a mistaken view, for ancient writers know nothing of canvas scenes; the background painted by Agatharchus was the wooden front of the stage building, and it was painted, not with reference to any particular play, but as a permanent decorative background, representing no doubt a palace or temple. Agatharchus is said to have been seized by Alcibiades and compelled by him to paint the interior of his house, which shows that at the time (about 435 ) decorative painting of rooms was the fashion.

AGATHIAS (c. 536–582), of Myrina in Aeolis, Greek poet and historian. He studied law at Alexandria, completed his training at Constantinople and practised as an advocate (scholasticus) in the courts. Literature, however, was his favourite pursuit. He wrote a number of short love-poems in epic metre, called Daphniaca. He next put together a kind of anthology, containing epigrams by earlier and contemporary poets and himself, under the title of a Cycle of New Epigrams. About a hundred epigrams by Agathias have been preserved in the Greek Anthology and show considerable taste and elegance. After the death of Justinian (565), some of Agathias’s friends persuaded him to write the history of his own times. This work, in five books, begins where Procopius ends, and is the chief authority for the period 552–558. It deals chiefly with the struggles of the Byzantine army, under the command of the eunuch Narses, against the Goths, Vandals; Franks and Persians. The author prides himself on his honesty and impartiality, but he is lacking in judgment and knowledge of facts; the work, however, is valuable from the importance of the events of which it treats. Gibbon contrasts Agathias as “a poet and rhetorician” with Procopius “a statesman and soldier.”

AGATHO, pope from 678 to 681, was born in Sicily. He is noteworthy as the pope who ordered St Wilfrid to be restored to his bishopric at York in 679, and as the first to cease payment of the tribute hitherto paid on election to the emperor at Constantinople. It was during his pontificate that the 6th oecumenical council was held at Constantinople, to which he sent his legates and those from a Roman council held in 679. Agatho died on the 10th of January 681.

AGATHOCLES (361–289 ), tyrant of Syracuse, was born at Thermae Himeraeae (mod. Termini Imerese) in Sicily. The son of a potter who had removed to Syracuse, he learned his father’s trade, but afterwards entered the army. In 333 he married the widow of his patron Damas, a distinguished and wealthy citizen. He was twice banished for attempting to overthrow the oligarchical party in (q.v.); in 317 he returned with an army of mercenaries under a solemn oath to observe the democratic constitution which was then set up. Having banished or murdered some 10,000 citizens, and thus made himself master of Syracuse, he created a strong army and fleet and subdued the greater part of Sicily. War with Carthage followed. In 310 Agathocles, defeated and besieged in Syracuse, took the desperate resolve of breaking through the blockade and attacking the enemy in Africa. After several victories he was at last completely defeated (306) and fled secretly to Sicily. After concluding peace with Carthage, Agathocles styled himself king of Sicily, and established his rule over the Greek cities of the island more firmly than ever. Even in his old age he displayed the same restless energy, and is said to have been meditating a fresh attack on Carthage at the time of his death. His last years were harassed by ill-health and the turbulence of his grandson Archagathus, at whose instigation he is said to have been poisoned; according to others, he died a natural death. He was a born leader of mercenaries, and, although he did not shrink from cruelty to gain his ends, he afterwards showed himself a mild and popular “tyrant.”