SIAM (9,000 of Siamese, Chinese, Shans, and Malays), occupies the central portion of the Indo-Chinese peninsula, wedged in between Annam and Cambodia (E.) and Burma (W.), and extending down into the Malay Peninsula; the wide Gulf of Siam forms the southern boundary; the rich alluvial valleys of the Menam and the Mekhong produce great quantities of rice (chief export), teak-wood, hemp, tobacco, cotton, etc., but of the land surface only about one-twentieth is cultivated, a large portion of the rest lying under forest and jungle; the Siamese are indolent, ignorant, ceremonious, and the trade is mainly in the hands of the Chinese; the mining of gold, tin, and especially rubies and sapphires, is also carried on.  Buddhism is the national religion, and elementary education is well advanced; government is vested in a king (at present an enlightened and English-educated monarch) and council of ministers; since Sir J. Bowring’s treaty in 1856, opening up the country to European trade and influences, progress has been considerable in roads and railway, electric, telephonic, and postal communication.  BANGKOK (q. v.) is the capital.  In 1893 a large tract of territory NE. of the Mekhong was ceded to France.

SIAMESE TWINS, twins born in Siam, of Chinese parents, whose bodies were united by a fleshy band extended between corresponding breast-bones; were purchased from their mother and exhibited in Europe and America, realised a competency by their exhibitions, married and settled in the States; having lost by the Civil War, they came over to London and exhibited, where they died, one 21/2 hours after the other (1811-1874).

SIBBALD, SIR ROBERT, physician and naturalist, born in Edinburgh, of Balgonie, Fife; established a botanic garden in Edinburgh, and was one of the founders of the Royal College of Physicians (16411712).

SIBERIA (5,000), a vast Russian territory in North Asia (one and a third times the size of Europe), stretching from the Ural Mountains (W.) to the seas of Behring, Okhotsk, and Japan (E.), bounded on the N. by the Arctic Ocean and on the S. by China and the Central Asiatic provinces of Russia; forms in the main an immense plain, sloping from the Altai and other mountain ranges on the S. to the dreary, ice-bound littoral on the N., drained by the northward-flowing Obi, Irtish, Yenesei, Lena, &c., embracing every kind of soil, from the fertile grain-growing plains of the S. and rich grazing steppe-land of the W. to the forest tracts and bogland of the N. and experiencing a variety of climates, but for the most part severely cold; hunting, fishing, and mining are the chief industries, with agriculture and stock-raising in the S. and W. The great Trans-Siberian Railway, in construction since 1891, is opening up the country, which is divided into eight “governments,” the chief towns being Tomsk, Irkutsk, Omsk, and Tobolsk; three-fifths of the population are Russians, chiefly exiles and descendants of exiles.  Russian advance in Asia against the Tartars was begun in 1850, and was carried on by warlike Cossack marauders, followed by hunters, droves of escaping serfs, and persecuted religious sects.