This section is from the book "The Scientific American Boy", by A. Russell Bond. Also available from Amazon: The Scientific American Boy.
He introduced me to a cave which he believed was known to only two other boys, both of whom had since moved to New York city. The mouth of the cave was almost closed by a large boulder that had lodged in front of it. We had to climb to the top of this rock, and then letting ourselves down with a rope we slid down the sloping rear face of the boulder into a crevice in the rocks. Then after squirming under a ledge we emerged into a large chamber, which appeared to be as dark as night after our sudden entrance from the outer light.

Fig. 226. Sliding Down into the Cave.
Bill lighted a candle which projected from a chink in the wall. By its light I saw that there was a pool in the center of the cave fed from a spring at one point. From the pool the water trickled off into a tiny stream to the mouth of the cave, where it was lost in a crack in the rocks. The water was ice cold and clear as crystal. Around the pool were several chairs and a table made by Bill and his two friends. That was evidently where Bill had gotten his idea of a subterranean club.
 
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