We felt as though we were living over a volcano.

How soon our ledge, of the same material, might be attacked, we had no means of knowing.

Overcome with drowsiness, we again disposed our blankets, resolved to get as many naps as possible before even these constrained quarters were taken from us.
This happened sooner and in a manner otherwise than we had expected.
Windy Bill brought us to consciousness by a wild yell.
Consciousness reported to us a strange, hurried sound like the long roll on a drum.

Investigation showed us that this cave, too, had sprung a leak; not with any premonitory drip, but all at once, as though someone had turned on a faucet.

In ten seconds a very competent streamlet six inches wide had eroded a course down through the guano, past the fire and to the outer slope.