Every bend of the river gave them a new picture to look at, and finally Sam had to use authority to make the boys lie down.
"We must all sleep some," he said, "for to-morrow the sun will shine too strong for sleeping, and we've done a hard day's work.

It will be now about seven or eight hours until sunrise, and there are just seven of us.

It will take half an hour for the rest of you to get to sleep, and so I'll run the boat for an hour and a half.

Then I'll wake Billy, and he can run it an hour.

Then Joe must take the paddle,--his name is Butler, you see,--and so on in alphabetical order, each of you taking charge for an hour.