CHAPTER VI.
THE SEA-MAID.
Caius understood that he had still three miles of the level beach to tread.

At first he hardly felt the sand under his feet, they were so dead with cold.

The spray from the roaring tide struck his face sideways.

He had time now to watch each variation, each in and out of the dune, and he looked at them eagerly, as the only change that was afforded to the monotony.

Then for the first time he learned how completely a man is shut out from all one half of the world by the simple command not to look behind him, and all the unseen half of his world became rife, in his thought, with mysterious creatures and their works.