'We're probably over some ledge of rock that carries the sound.' "'It's the first time I've heard it,' replied my wife doubtfully.

We listened again.

Then through the dim rhythms, deep beneath us, another sound came.

It drifted across the lagoon that lay between us and Nan-Tauach in little tinkling waves.

It was music--of a sort; I won't describe the strange effect it had upon me.