of glass produced in the United States in that year. The growth in the preceding decade of the iron and steel industry, the products of which increased in value from $4,742,760 in 1890 to $19,338,481 in 1900 (307.7%), and of the manufacture of glass, the value of which increased from $2,995,409 in 1890 to $14,757,883 in 1900 (392.7%), is directly attributable to the development of natural gas as fuel; the decrease in the value of the products of these same industries in 1900-1905 is partly due to the growing scarcity of the natural gas supply. As compared with the other states of the United States in value of manufactured products, Indiana ranked second in 1900 and in 1905 in carriages and wagons, glass and distilled liquors; was seventh in 1900 and fourth in 1905 in furniture; was fourth in 1900 and seventh in 1905 in wholesale slaughtering and meat-packing; was fifth in 1900 and sixth in 1905 in agricultural implements; and in iron and steel and flour and grist mill products was fifth in 1900 and eighth in 1905. The most important manufacturing centres are Indianapolis, Terre Haute, Evansville, South Bend, Fort Wayne, Anderson, Hammond, Richmond, Muncie, Michigan City and Elwood, each having a gross annual product of more than $6,000,000. According to the annual report on _Mineral Resources of the United States_ for 1906, Indiana ranked fifth in the Union in the value of natural gas produced, sixth in petroleum, and sixth in coal. Natural gas was discovered in 1886 in the east-central part of the state, and its general application to manufacturing purposes caused an industrial revolution in the immediate region. Pipe lines carried it to various manufacturing centres within the state and to Chicago, Ill., and Dayton, Ohio. During the early years an enormous amount was wasted; this was soon prohibited by law, and a realization that the supply was not unlimited resulted in a better appreciation of its great value. The gas, which is found in the Trenton limestone, had an initial pressure at the point of discovery of 325 lb.; this pressure had decreased in the field centre by January 1896 to 230 lb., and by January 1901 to 115 lb., the general average of pressure at the latter date being 80 lb. The gas field extends over Hancock, Henry, Hamilton, Tipton, Madison, Grant and Delaware counties. The value of the output fell from $7,254,539 in 1900 to $1,750,715 in 1906, when the state's product was only 4.2% of that of the entire country. On the 1st of January 1909 there were 3223 wells in operation, some of which were 1200 ft. deep. It has been found that "dead" gas wells, if drilled somewhat deeper, generally become active oil wells. The development of the petroleum field, which extends over Adams, Wells, Jay, Blackford and Grant counties, was rapid up to 1904. The annual output increased from 33,375 barrels in 1889 to 11,339,124 barrels in 1904, the latter