Page:EB1911 - Volume 16.djvu/156

 by the occasional occurrence in those lamprophyres of leucite, haüyne and other felspathoid minerals.

The camptonites (called after Campton, New Hampshire) are dark brown, nearly black rocks often with large hornblende phenocrysts. Their essential minerals in thin section are hornblende of a strong reddish-brown colour; augite purple, pleochroic and rich in titanium, olivine and plagioclase felspar. They have the porphyritic and panidiomorphic structures described in the rocks of the previous group, and like them also have an ocellar character, often very conspicuous under the microscope. The accessory minerals are biotite, apatite, iron oxides and analcite. They decompose readily and are then filled with carbonates. Many of these rocks prove on analysis to be exceedingly rich in titanium; they may contain 4 or 5% of titanium dioxide.

The monchiquites (called after the Serra de Monchique, Portugal) are fine-grained and devoid of felspar. Their essential constituents are olivine and purplish augite. Brown hornblende, like that of the camptonites, occurs in many of them. An interstitial substance is present, which may sometimes be a brown glass, but at other times is colourless and is believed by some petrographers to be primary crystalline analcite. They would define the monchiquites as rocks consisting of olivine, augite and analcite; others regard the analcite as secondary, and consider the base as essentially glassy. Some monchiquites contain haüyne; while in others small leucites are found. Ocellar structure is occasionally present, though less marked than in the camptonites. A special group of monchiquites rich in deep brown biotite has been called fourchites (after the Fourche Mountains, Arkansas).

The alnoites (called after the island of Alnö in Norway) are rare rocks found in Norway, Montreal and other parts of North America and in the north of Scotland. They contain olivine, augite, brown biotite and melilite. They are free from felspar, and contain very low percentages of silica.

The chemical composition of some of these rocks will be indicated by the analyses of certain well-known examples.

{| align=center
 * -align=center
 * || |SiO2 || |TiO2 || |Al2O3 || |Fe2O3 || |FeO || |MgO || |CaO || |Na2O || |K2O
 * -align=center
 * I. || |52.70 || |1.71 || |15.07 || |8.41 || |... || |7.23 || |5.33 || |3.12 || 4.81
 * -align=center
 * II. || |52.12 || |1.20 || |13.52 || |2.56 || |4.53 || |6.36 || |5.78 || |2.34 || 5.36
 * -align=center
 * III.|| |45.15 || |... || |15.39 || |2.76 || |5.64 || |6.38 || |8.83 || |2.67 || 2.77
 * -align=center
 * IV.|| |54.67 || |... || |12.68 || |11.68&ensp; || |2.13 || |6.11 || |4.96 || |3.85 || 3.65
 * -align=center
 * V.|| |41.96 || |4.15 || |15.36 || |3.27 || |9.89 || |5.01 || |9.47 || |5.15 || 0.19
 * -align=center
 * VI.|| |43.74 || |2.80 || |14.82 || |2.40 || |7.52 || |6.98 || |10.81&ensp; || |3.06 || 2.90
 * -align=center
 * VII.|| |29.25 || |2.54 || |&ensp;8.80 || |3.92 || |5.42 || |17.66&ensp; || |17.86&ensp; || |0.77 || 2.45

In addition to the oxides given these rocks contain small quantities of water (combined and hygroscopic), CO2, S, MnO, P2O5, Ca2O3, &c.

 LAMPSACUS, an ancient Greek colony in Mysia, Asia Minor, known as Pityusa or Pityussa before its colonization by Ionian Greeks from Phocaea and Miletus, was situated on the Hellespont, opposite Callipolis (Gallipoli) in Thrace. It possessed a good harbour; and the neighbourhood was famous for its wine, so that, having fallen into the hands of the Persians during the Ionian revolt, it was assigned by Artaxerxes I. to Themistocles to provide him with wine, as Percote did with meat and Magnesia with bread. After the battle of Mycale (479 ), Lampsacus joined the Athenians, but, having revolted from them in 411, was reduced by force. It was defended in 196 against Antiochus the Great of Syria, after which its inhabitants were received as allies of Rome. Lampsacus was the chief seat of the worship of Priapus, a gross nature-god closely connected with the culture of the vine. The ancient name is preserved in that of the modern village of Lapsaki, but the Greek town possibly lay at Chardak immediately opposite Gallipoli.

See A. L. Castellan, Lettres sur la Morée, l’Hellespont, &c. (Paris, 1820); Choiseul Gouffier, Voyage pittoresque dans l’empire ottoman (1842).

 LAMPSTAND, a pillar, tripod or figure extending to the floor for supporting or holding a lamp. The lampstand (lampadère) is probably of French origin; it appears to have been in use in France before the end of the 17th century.

 LANARK, a royal, municipal and police burgh, and county town of Lanarkshire, Scotland, standing on high ground about half a mile from the right bank of the Clyde, 31 m. S.E. of Glasgow by the Caledonian railway. Pop. (1901) 6440. It is a favourite holiday resort, being the point from which the falls of the Clyde are usually visited. The principal buildings are the town hall, the county buildings, the assembly rooms, occupying the site of an old Franciscan monastery, three hospitals, a convalescent home, the Smyllum orphanage and the Queen Victoria Jubilee fountain. The industries include cotton-spinning, weaving, nail-making and oilworks, and there are frequent markets for cattle and sheep. Lanark is a place of considerable antiquity. Kenneth II. held a parliament here in 978, and it was sometimes the residence of the Scottish kings, one of whom, William the Lion (d. 1214), granted it a charter. Several of the earlier exploits of William Wallace were achieved in the neighbourhood. He burned the town and slew the English sheriff William Hezelrig. About 1 m. N.W. are Cartland Craigs, where Mouse Water runs through a precipitous red sandstone ravine, the sides of which are about 400 ft. high. The stream is crossed by a bridge of single span, supposed to be Roman, and by a three-arched bridge, designed by Thomas Telford and erected in 1823. On the right bank, near this bridge, is the cave in which Wallace concealed himself after killing Hezelrig and which still bears his name. Lanark was the centre of much activity in the days of the Covenanters. William Lithgow (1582–1645), the traveller, William Smellie (1697–1763), the obstetrician and Gavin Hamilton (1730–1797), the painter, were born at Lanark. The town is one of the Falkirk district group of parliamentary burghs, the other constituents being Airdrie, Hamilton, Falkirk and Linlithgow.

New Lanark (pop. 795), 1 m. S., is famous in connexion with the socialist experiments of Robert Owen. The village was founded by David Dale (1739–1806) in 1785, with the support of Sir Richard Arkwright, inventor of the spinning-frame, who thought the spot might be made the Manchester of Scotland. In ten years four cotton mills were running, employing nearly 1400 hands. They were sold in 1799 to a Manchester company, who appointed Owen manager. In the same year he married Dale’s daughter. For many years the mills were successfully conducted, but friction ultimately arose and Owen retired in 1828. The mills, however, are still carried on.

There are several interesting places near Lanark. Braxfield, on the Clyde, gave the title of Lord Braxfield to Robert Macqueen (1722–1799), who was born in the mansion and acquired on the bench the character of the Scottish Jeffreys. Robert Baillie, the patriot who was executed for conscience’ sake (1684), belonged to Jerviswood, an estate on the Mouse. Lee House, the home of the Lockharts, is 3 m. N.W. The old castle was largely rebuilt in the 19th century. It contains some fine tapestry and portraits, and the Lee Penny—familiar to readers of Sir Walter Scott’s Talisman—which was brought from Palestine in the 14th century by the Crusading knight, Sir Simon Lockhart. It is described as a cornelian encased in a silver coin. Craignethan Castle on the Nethan, a left-hand tributary joining the Clyde at Crossford, is said to be the original of the “Tillietudiem” of Scott’s Old Mortality.

 LANARKSHIRE, a south-western county of Scotland, bounded N. by the shires of Dumbarton and Stirling, E. by Linlithgowshire, Mid-Lothian and Peeblesshire, S. by Dumfriesshire and W. by the counties of Ayr, Renfrew and Dumbarton. Its area is 879 sq. m. (562,821 acres). It may be described as embracing the valley of the Clyde; and, in addition to the gradual descent from the high land in the south, it is also characterized by a gentle slope towards both banks of the river. The shire is divided into three wards, the Upper, comprising all the southern section, or more than half the whole area (over 330,000 acres); the Middle, with Hamilton for its chief town, covering fully 190,000 acres; and the Lower, occupying the northern area of about 40,000 acres. The surface falls gradually from the uplands in the south to the Firth of Clyde. The highest hills are nearly all on or close to the borders of Peeblesshire and Dumfriesshire, and include Culter Fell (2454 ft.) and Lowther Hill (2377). The loftiest heights exclusively belonging to Lanarkshire are Green Lowther (2403), Tinto (2335), Ballencleuch Law (2267), Rodger Law (2257), Dun Law (2216), Shiel Dod (2190), Dungrain Law (2186) and Comb Law (2107). The principal rivers are the Clyde and its head waters and affluents (on the right, the Medwin, Mouse, South Calder, North