barges are owned by the coal operators to enable them to leave the loaded barges at their various points of coal delivery, down the Ohio, or on the Mississippi and other rivers, while they return to Pittsburg with a corresponding fleet of empty barges, to be again loaded, ready for the next coal-boat freshet. As these barges, when loaded draw from six feet to eight feet of water, it is obvious that they can only descend when there is what is now called a 'coal-boat rise' in the river—that is, a flood giving not less than eight feet water in the channels.
"This coal shipment from Pittsburg, which in 1844 only amounted to about 2,500,000 bushels per annum, now amounts to about 40,000,000 bushels per annum. I have, in the special report mentioned, referred to the construction of railroads as having affected the business which was formerly carried on the Ohio river during the comparatively low water. The lower the water, the higher the rates of freight and passenger travel, when there was no railroad competition; but now, when the prices on the river during very low water approach
