Page:Hound of Baskervilles.djvu/166

 “Bogs make queer noises sometimes. It’s the mud settling, or the water rising, or something.”

“No, no, that was a living voice.”

“Well, perhaps it was. Did you ever hear a bittern booming?”

“No, I never did.”

“It’s a very rare bird—practically extinct—in England now, but all things are possible upon the moor. Yes, I should not be surprised to learn that what we have heard is the cry of the last of the bitterns.”

“It’s the weirdest, strangest thing that ever I heard in my life.”

“Yes, it’s rather an uncanny place altogether. Look at the hillside yonder. What do you make of those?”

The whole steep slope was covered with grey circular rings of stone, a score of them at least.

“What are they? Sheep-pens?”

“No, they are the homes of our worthy ancestors. Prehistoric man lived thickly on the moor, and as no one in particular has