The soil of the greater part of the state consists of a drift deposit of loose calcareous loam, which extends to a considerable depth, and which is exceedingly fertile. In the Ohio and White Water river valleys a sandstone and limestone formation predominates. The north and north central portions of the state, formerly rather swampy, have become since the clearing of the forests as productive as the south central. The most fertile part of the state is the Wabash valley; the least fertile the sandy region, of small extent, immediately south of Lake Michigan. _Industry and Manufactures._--Agriculture has always been and still is the chief industry of the state of Indiana. According to the census of 1900, 94.1% of the land area was included in farms, and of this 77.2% was improved. The proportion of farms rented comprised 28.6% of the whole number, four-fifths of these being rented on a share basis. The average size of farms, which in 1850 was 136.2 acres, had decreased to 105.3 acres in 1880 and to 97.4 acres in 1900. The value of the farm property increased from $726,781,857 in 1880 to $978,616,471 in 1900. The farms are commonly cultivated on the three-crop rotation system. The proximity of such good markets as Chicago, Cincinnati, St Louis and Louisville, in addition to the local markets, and the unusual opportunities afforded by the railways that traverse every portion of the state, have been important factors in the rapid agricultural advance which has enabled Indiana to keep pace with the newly developed states farther west. Indiana was ninth in the value of its agricultural products in 1889, and retained the same relative rank in 1899, although the value had considerably more than doubled, increasing from $94,759,262 in 1889 to $204,450,196 in 1899. The principal crops in which the state has maintained a high relative rank are Indian corn, wheat and hay; the acreage devoted to each of these increased considerably in the decade 1890-1900. In 1907, according to the Department of Agriculture, the acreage of Indian corn was 4,690,000 acres (7th of the states), and the yield was 168,840,000 bushels (5th of the states); of wheat, 2,362,000 acres (6th of the states) was planted, and the crop was 34,013,000 bushels (7th of the states); and 2,328,000 acres of hay (the 8th largest acreage among the states of the United States) produced 3,143,000 tons (the 8th largest crop). Other important staple crops are oats, rye and potatoes, of which the crops in 1907 were respectively 36,683,000 bushels, 961,000 bushels, and 7,308,000 bushels. There are no well-defined crop belts, the production of the various crops being general throughout the state, except in the case of potatoes, most of which are raised in the sandy regions of the north. The value of the orchard products is large, and is steadily increasing: in the decade 1890-1900 the number