"Oh, I'm some frightened myself," said Dot. "But I don't know what we can do."
"I know," declared Tot, solemnly.
"What?" she inquired, in an anxious voice.
"Nuthin'."
Dot saw no need of replying to this, and another long period of silence followed.
They did not seem to be in any immediate danger, for the boat swept along with a free, easy motion that was very pleasant, and the air was delightfully cool after the heat of the sun outside in the open river.
But two things worried Dot. One was the fact that she was being carried a long ways from home, and the other a fear of where the underground river might lead them. She wasn't at all sure they were not floating down into the middle of the earth, and the chances of ever seeing Roselawn again were growing smaller every minute.
Nothing seemed to worry Tot, however. The darkness and the murmuring of the water made him drowsy, and before long he was fast asleep, with his chubby little arms clasped around Dot's neck.
The girl was also gradually recovering from her fright, since nothing terrible seemed to happen. They were having a long journey under the cliffs; but she knew there must come an end to it some time, and probably they would float out of the dark tunnel into the daylight sooner or later.
On and on sped the little boat, until at last, as Dot lay staring into the darkness, she noticed a dim light about her, and began to see the rocky roof of the cavern through which they were passing.