Read it through once

But after a while the steamboats so increased in number and in speed that they were able to absorb the entire commerce; and then keelboating died a permanent death. The keelboatman became a deck hand, or a mate, or a pilot on the steamer; and when steamer-berths were not open to him, he took a berth on a Pittsburgh coal-flat, or on a pine-raft constructed in the forests up toward the sources of the Mississippi.