“Well, there’s nothing going on in the mine to-day. Father’s too sore to head the men, and he’s going to lie down and rest till his arm’s better. What do you say to having a good long day below there, and finding which way the river runs—the one we heard?”

“Bah! Stuff! Rubbish! After being up fighting all the night! You must be mad.”

“No, I aren’t,” said Dummy. “I only want you to come. It’ll do you good. You don’t know how much better you’ll feel after a good walk and climb down there.”

“What’s the good, Dummy?”

“We want to find out where the water goes to that is always falling. I’m sure some of it comes out of our river, where the hole’s in the stream.”

“And what good will it do to know where the water goes?”

“I don’t know, but I want to. Can’t go to work after such a night as we had. There’s nobody down the mine to-day.”

Mark put his hand to the place where he had received the blow.

“Headache, Master Mark?”

“Yes. All jarred-like.”