Natural gas derived from the Trenton limestone has supplied during the last year and is now supplying all the fuel and a considerable part of the artificial light that is used by at least four hundred thousand people in northwestern Ohio and in central Indiana. Within the same limits it is the basis of a varied line of manufactures, the annual product of which will make an aggregate of many millions of dollars. More than forty glass furnaces, not one of them three years old, are now in very successful operation within the territory named, while iron and steel mills, potteries and brick works, and a long list of factories in which cheap power is a desideratum, have been built up on all sides with wonderful rapidity.
The largest gas production of the Trenton limestone that has yet been reached is to be credited to . . .