about it,
wondering and admiring, and presently left it by one of the numerous
passages that opened into it. This shortly brought them to a bewitching
spring, whose basin was incrusted with a frostwork of glittering
crystals; it was in the midst of a cavern whose walls were supported by
many fantastic pillars which had been formed by the joining of great
stalactites and stalagmites together, the result of the ceaseless
water-drip of centuries. Under the roof vast knots of bats had packed
themselves together, thousands in a bunch; the lights disturbed the
creatures and they came flocking down by hundreds, squeaking and
darting furiously at the candles. Tom knew their ways and the danger of
this sort of conduct. He seized Becky's hand and hurried her into the
first corridor that offered; and none too soon, for a bat struck
Becky's light out with its wing while she was passing out of the
cavern. The bats chased the children a good distance; but the fugitives
plunged into every new passage that offered, and at last got rid of the
perilous things. Tom found a subterranean lake, shortly, which
stretched its dim length away until its shape was lost in the shadows.
He wanted to explore its borders, but concluded that it would be best
to sit down and rest awhile, first. Now, for the first time, the deep
stillness of the place laid a clammy hand upon the spirits of the
children. Becky said:

"Why, I didn't notice, but it seems ever so long since I heard any of
the others."

"Come to think, Becky, we are away down below them--and I don't know
how far away north, or south, or east, or whichever it is. We couldn't
hear them here."

Becky grew apprehensive.

"I wonder how long we've been down here, Tom? We better start back."

"Yes, I reckon we better. P'raps we better."

"Can you find the way, Tom? It's all a mixed-up crookedness to me."

"I reckon I could find it--but then the bats. If they put our candles
out it will be an awful fix. Let's try some other way, so as not to go
through there."

"Well. But I hope we won't get lost. It would be so awful!" and the
girl shuddered at the thought of the dreadful possibilities.

They started through a corridor, and traversed it in silence a long
way, glancing at each new opening, to see if there was anything
familiar about the look of it; but they were all strange. Every time
Tom made an examination, Becky would watch his face for an encouraging
sign, and he would say cheerily: