“How could it come from the waterfall?” Walter asked.
“I don’t know,” said Cora. “But there might be some sort of hollow rock—blowing stones I believe they are called—and when air is forced into the hollow, by the action of the water, it might give a roaring sound, and vibrate the earth.”
Walter considered a moment.
“It’s worth looking into,” he said. “I won’t say anything, but the first chance I get I’ll have a peep at the fall. I think I can get behind the water curtain.”
“Oh, Walter! don’t take any risks.”
“I won’t, Cora. But come on. The others will wonder what we find to talk about and look at here. Not that I wouldn’t want to stay talking a great deal longer, but, well——”
“I understand,” and she smiled.
“We’re going berrying,” cried Bess, as Walter and Cora came up to join the others. “That is, unless you two want to stand there on the edge of ‘Lovers’ Leap’ and think sad thoughts.”
“Is that place called Lovers’ Leap?” asked Cora.
“Well, it might be if any lovers ever jumped off there. Do you want to go berrying?”