The filling up of a swamp, then, in this case at least, is not the result of a deposition of vegetable matter washed into it, settling to the bottom and leaving the surface clear, so filling it up from the bottom to the top . . .
The filling up of a swamp, then, in this case at least, is not the result of a deposition of vegetable matter washed into it, settling to the bottom and leaving the surface clear, so filling it up from the bottom to the top . . .
