"That must be it," said Charley. "It's dense enough, goodness knows! And there is a little stream of water stealing out of the lower side of the thicket. So there is a spring in there. Let's go down and take a look at it."

They shouldered their packs, whistled the pup to their heels, and went down to the thicket. In a space not less than a hundred yards in diameter rhododendrons grew in indescribable density, while above them towered some huge hemlocks. The two boys came close to the thicket and peered into it. Even now, in the bright glare of the full sun, deep twilight reigned beneath the rhododendrons. Evidently they were growths of great age. Their stems were like young saplings. Their tops rose high and spread wide. And their branches were laced and interlaced and twisted and grown together so as to make a mass almost impenetrable.

"Great Ned!" cried Lew. "A passer-by would have about as much chance of seeing us in there as we have of discovering China from this hillside. The question is, how are we going to get into the place?"

Charley dropped on his hands and knees and crawled slowly under the low rhododendron branches.

"Keep right in my tracks, Lew, if you come in," warned Charley. "If there are any snakes in here, they'd bite a fellow before he could see them. I'll look sharp for them and if you follow me, you won't run any risk."

He picked up a fallen branch, trimmed it, and crept on, stick in hand. Suddenly he crowded back hard on Lew, almost kicking him in the face. At the same time he began to thrash about in the leaves ahead of him.

"Great Cæsar!" he exclaimed. "I almost crawled on a big rattler. He was so near the color of the ground that I didn't see him until he coiled and raised his head. Gee! That was a close shave."

"As long as you didn't get bitten," said Lew, "It's a good thing it happened. We'll be on our guard now."

"Yes, indeed. Did you put the potassium permanganate in the first-aid kit, and the hypodermic syringe?"

"Surest thing you know."