caverns on the Little Hockhocking, 3;
limestone and coal, salt borings, 4;
gas from springs, 5;
petroleum, 5;
iron ore, 7;
ochres, pyrites, 8.
—, notes on, in reply to inquiries by C. Atwater, S. P. Hildreth, x, 152;
–Marietta, size, manufactures, &c., 152;
county of Washington, statistics, 153;
settlement of different places of Ohio, 153, 154, 155;