Read it through once

That is well enough, but I did not suppose those snags were 900 feet high. Still they were a very fine show. They stood boldly out by themselves, and made a fascinatingly odd spectacle. But there was nothing about their appearance to suggest the heads of a hydra. They looked like a row of lofty slabs with their upper ends tapered to the shape of a carving-knife point; in fact, the early voyager, ignorant of their great height, might have mistaken them for a rusty old rank of piles that had sagged this way and that out of the perpendicular.