INDIAN TERRITORY (186), a stretch of country in the basin of the Arkansas, Canadian, and Red Rivers, with Kansas on the N., Arkansas on the E., Oklahoma Territory on the W., and separated by the Red River from Texas on the S., set apart for the occupation of the Indian tribes of the western prairies; formerly double its present size, it has been reduced by the purchase in 1890 of Oklahoma.; in the centre and east are fertile plains and great forests of walnut and maple, in which deer and bears abound; the west is a treeless prairie supporting vast herds of cattle; mineral resources are probably rich, but are undeveloped; the principal tribes have their own organisations and civilised institutions, churches, schools, banks, and newspapers; the towns are small, Tahlequah, Lehigh, and M’Alister are the chief.

INDIANA (2,192), one of the smaller but most populous States of the American Union, lies between Lake Michigan and the Ohio River, with Ohio on the E. and Illinois on the W.; the climate is marked by extremes of heat and cold; the country is somewhat hilly in the S., is mostly level, well watered, and very fertile; agriculture is the chief industry, cereals, potatoes, and tobacco forming the chief crops; there is great mineral wealth, with extensive and varied industries, embracing iron, glass, and textile manufactures, waggon-building, and furniture-making; petroleum wells are abundant, and in one part of the territory natural gas is found in great quantities.  First occupied by the French, Indiana was acquired by Britain in 1763, ceded to America 1783, and admitted to the Union in 1816; education in the State university and schools is free; besides Indianapolis, the capital, the largest towns are Evansville (50), Fort Wayne (30), and Terre Haute (30).

INDIANAPOLIS (169), capital of Indiana, on the White Ford River, in the centre of the State; a fine city, with wide, tree-lined streets, large iron, brass, and textile manufactures, and canned-meat industry; is a great railroad centre.

INDIANS, AMERICAN, the aborigines of America, and now gradually dying out; these aborigines were called Indians by Columbus, because when he discovered America he thought it was India.  See AMERICAN INDIANS.

INDIA-RUBBER, CAOUTCHOUC, or GUM ELASTIC, is a product of the milky juices of several tropical and sub-tropical plants found in the West Indies, Central and South America, West Africa, and India; there is evidence that its properties were partially known to the Spaniards in the West Indies early in the 17th century; but its first introduction to this country was about 1770, when it was employed by artists for erasing black-lead pencil marks, hence its familiar name; it is collected by making incisions in the tree trunk and gathering the slowly exuding juice, which is first solidified by drying, then purified by boiling and washing; it is flexible and elastic, insoluble in water, and impenetrable to gases and fluids, and these qualities give it great