Do you see that dark irregularity ahead ?" "Yes; is it a cloud ?" "No; the Arkansas sand dunes.

I am going to try to keep the horses moving until we arrive there.

Then we will halt and eat whatever Neb has packed behind him, and rest for an hour or two.

You look very tired, but I hope you can keep up for that distance.

We shall be safely out of sight then." "Indeed, I am tired; the strain of waiting alone in that cabin, and all that happened last night, have tried me severely.