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 fine high altar of the 17th century; its lofty tower serves as a landmark for sailors. A gateway flanked by turrets (14th century) is a relic of the Hôtel de Guise, built as a gild hall for the English woolstaplers, and given to the duke of Guise as a reward for the recapture of Calais. The modern town-hall and a church of the 19th century are the chief buildings of the quarter of St Pierre. Calais has a board of trade-arbitrators, a tribunal and a chamber of commerce, a commercial and industrial school, and a communal college.

The harbour is entered from the roads by way of a channel leading to the outer harbour which communicates with a floating basin 22 acres in extent, on the east, and with the older and less commodious portion of the harbour to the north and west of the old town. The harbour is connected by canals with the river Aa and the navigable waterways of the department.

Calais is the principal port for the continental passenger traffic with England carried on by the South-Eastern & Chatham and the Northern of France railways. The average number of passengers between Dover and Calais for the years 1902–1906 inclusive was 315,012. Trade is chiefly with the United Kingdom. The principal exports are wines, especially champagne, spirits, hay, straw, wool, potatoes, woven goods, fruit, glass-ware, lace and metal-ware. Imports include cotton and silk goods, coal, iron and steel, petroleum, timber, raw wool, cotton yarn and cork. During the five years 1901–1905 the average annual value of exports was £8,388,000 (£6,363,000 in the years 1896–1900), of imports £4,145,000 (£3,759,000 in 1896–1900). In 1905, exclusive of passenger and mail boats, there entered the port 848 vessels of 312,477 tons and cleared 857 of 305,284 tons, these being engaged in the general carrying trade of the port. The main industry of Calais is the manufacture of tulle and lace, for which it is the chief centre in France. Brewing, saw-milling, boat-building, and the manufacture of biscuits, soap and submarine cables are also carried on. Deep-sea and coast fishing for cod, herring and mackerel employ over 1000 of the inhabitants.

Calais was a petty fishing-village, with a natural harbour at the mouth of a stream, till the end of the 10th century. It was first improved by Baldwin IV., count of Flanders, in 997, and afterwards, in 1224, was regularly fortified by Philip Hurepel, count of Boulogne. It was besieged in 1346, after the battle of Crécy, by Edward III. and held out resolutely by the bravery of Jean de Vienne, its governor, till after nearly a year’s siege famine forced it to surrender. Its inhabitants were saved from massacre by the devotion of Eustache de St Pierre and six of the chief citizens, who were themselves spared at the prayer of Queen Philippa. The city remained in the hands of the English till 1558, when it was taken by Francis, duke of Guise, at the head of 30,000 men from the ill-provided English garrison, only 800 strong, after a siege of seven days. From this time the Calaisis or territory of Calais was known as the Pays Reconquis. It was held by the Spaniards from 1595 to 1598, but was restored to France by the treaty of Vervins.

CALAIS, a city and sub-port of entry of Washington county, Maine, U.S.A., on the Saint Croix river, 12 m. from its mouth, opposite Saint Stephens, New Brunswick, with which it is connected by bridges. Pop. (1890) 7290;(1900) 7655 (1908 being foreign-born); (1910) 6116. It is served by the Washington County railway (102.5 m. to Washington Junction, where it connects with the Maine Central railway), and by steamboat lines to Boston, Portland and Saint Johns. In the city limits are the post-offices of Calais, Milltown and Red Beach. The city has a small public library. The valley here is wide and deep, the banks of the river bold and picturesque, and the tide rises and falls about 25 ft. The city has important interests in lumber, besides foundries, machine shops, granite works—there are several granite (notably red granite) quarries in the vicinity—a tannery, and manufactories of shoes and calcined plaster. Big Island, now in the city of Calais, was visited in the winter of 1604–1605 by Pierre du Guast, sieur de Monts. Calais was first settled in 1779, was incorporated as a town in 1809, and was chartered as a city in 1851.

CALAÏS and ZETES (the Boreadae), in Greek mythology, the winged twin sons of Boreas and Oreithyia. On their arrival with the Argonauts at Salmydessus in Thrace, they liberated their sister Cleopatra, who had been thrown into prison with her two sons by her husband Phineus, the king of the country (Sophocles, Antigone, 966; Diod. Sic. iv. 44). According to another story, they delivered Phineus from the (q.v.), in pursuit of whom they perished (Apollodorus i. 9; iii. 15). Others say that they were slain by Heracles near the island of Tenos, in consequence of a quarrel with Tiphys, the pilot of the Argonauts, or because they refused to wait during the search for Hylas, the favourite of Heracles (Hyginus, Fab., 14. 273; schol. on Apollonius Rhodius i. 1304). They were changed by the gods into winds, and the pillars over their tombs in Tenos were said to wave whenever the wind blew from the north. Like the Harpies, Calaïs and Zetes are obvious personifications of winds. Legend attributed the foundation of Cales in Campania to Calaïs (Silius Italicus viii. 512).

CALAMINE, a mineral species consisting of zinc carbonate, ZnCO3, and forming an important ore of zinc. It is rhombohedral in crystallization and isomorphous with calcite and chalybite. Distinct crystals are somewhat rare; they have the form of the primitive rhombohedron (rr&#8202;′ = 72° 20′), the faces of which are generally curved and rough. Botryoidal and stalactitic masses are more common, or again the mineral may be compact and granular or loose and earthy. As in the other rhombohedral carbonates, the crystals possess perfect cleavages parallel to the faces of the rhombohedron. The hardness is 5; specific gravity, 4.4. The colour of the pure mineral is white; more often it is brownish, sometimes green or blue: a bright-yellow variety containing cadmium has been found in Arkansas, and is known locally as “turkey-fat ore.” The pure material contains 52% of zinc, but this is often partly replaced isomorphously by small amounts of iron and manganese, traces of calcium and magnesium, and sometimes by copper or cadmium.

Calamine is found in beds and veins in limestone rocks, and is often associated with galena and blende. It is a product of alteration of blende, having been formed from this by the action of carbonated waters; or in many cases the zinc sulphide may have been first oxidized to sulphate, which in solution acted on the surrounding limestone, producing zinc carbonate. The latter mode of origin is suggested by the frequent occurrence of calamine pseudomorphous after calcite, that is, having the form of calcite crystals. Deposits of calamine have been extensively mined in the limestones of the Mendip Hills, in Derbyshire, and at Alston Moor in Cumberland. It also occurs in large amount in the province of Santander in Spain, in Missouri, and at several other places where zinc ores are mined. The best crystals of the mineral were found many years ago at Chessy near Lyons; these are rhombohedra of a fine apple-green colour. A translucent botryoidal calamine banded with blue and green is found at Laurion in Greece, and has sometimes been cut and polished for small ornaments such as brooches.

The name calamine (German, Galmei), from lapis calaminaris, a Latin corruption of cadmia ( ), the old name for zinc ores in general (G. Agricola in 1546 derived it from the Latin calamus, a reed), was early used indiscriminately for the carbonate and the hydrous silicate of zinc, and even now both species are included by miners under the same term. The two minerals often closely resemble each other in appearance, and can usually only be distinguished by chemical analysis; they were first so distinguished by James Smithson in 1803. F. S. Beudant in 1832 restricted the name calamine to the hydrous silicate and proposed the name “smithsonite” for the carbonate, and these meanings of the terms are now adopted by Dana and many other mineralogists. Unfortunately, however, in England (following Brooke and Miller, 1852) these designations have been reversed, calamine being used for the carbonate and smithsonite for the silicate. This unfortunate confusion is somewhat lessened by the use of the terms zinc-spar and (q.v.) for the carbonate and silicate respectively.