Read it through once

We glided steadily down the river in the usual privacy--steamboat or other moving thing seldom seen. Scenery as always: stretch upon stretch of almost unbroken forest, on both sides of the river; soundless solitude. Here and there a cabin or two, standing in small openings on the gray and grassless banks--cabins which had formerly stood a quarter or half-mile farther to the front, and gradually been pulled farther and farther back as the shores caved in. As at Pilcher's Point, for instance, where the cabins had been moved back three hundred yards in three months, so we were told; but the caving banks had already caught up with them, and they were being conveyed rearward once more.