That was the beginning of a trade which has since grown to mammoth proportions, and which has become the foundation of the prosperity of Cleveland, for it is to the proximity and practically inexhaustibleness of its coal supply that Cleveland owes its manufacturing character, which is the secret of its rapid development within a few years, its present prosperity, and the assured greatness of its future. As a domestic fuel coal made slow progress in the city for many years, but other uses were found for it, and the receipts of coal by canal rapidly increased. Steamboats multiplied on the lakes, and these found the coal of Cleveland a valuable fuel. By degrees manufacturing was ventured on, in a small way, and there being no water-power of consequence, recourse was had to steam, which created a moderate demand for coal. For ten years the receipts increased steadily, until in 1838, it reached 2,496 tons. In 1848, it had grown to 66,551 tons, and in 1858--the canal transportation being supplemented by two lines of railroad crossing the coal fields on the way to Cleveland--to 222,267 tons. In 1868, it had swollen to 759,104 tons, and the demand continues to increase in a rate more than proportionate to the enlarged sources of supply and increased facilities for transportation. The opening of the Cleveland and Mahoning Railroad gave a strong stimulus to the coal trade of northern Ohio, and was one of the most important events in the history of Cleveland. By this time the beds of the valuable Briar Hill, or block coal, were tapped, which has proved the best fuel for manufacturing iron from the raw ore, and has no superior, if it has a rival, in the West. With the discovery of this bed of coal, blast furnaces and rolling mills were established in the Mahoning Valley, and as the uses of the coal became known in Cleveland and in other ports, a large demand, for consumption in the city and exports to other points, sprang up. Over one-half the amount of Ohio coal raised is of the Briar Hill grade, and of the whole amount of Ohio coal raised, about one-half finds its market in Cleveland.