be doing there at this hour, moving to and fro, as it seemed, without any visible purpose? It could scarcely be a stranger; for Claydyke, the nearest village, was ten miles distant; and what female would come ten miles across the fens, for no purpose but to hover over the surf under the walls of Nightmare Abbey? Might it not be a mermaid? It was possibly a mermaid. It was probably a mermaid. It was very probably a mermaid. Nay, what else could it be but a mermaid? It certainly was a mermaid. Mr. Asterias stole out of the library on tiptoe, with his finger on his lips, having beckoned Aquarius to follow him.
The rest of the party was in great surprise at Mr. Asterias's movement, and some of them approached the window to see if the locality would tend to elucidate the mystery. Presently they saw him and Aquarius cau-
