Then he tied a buoy to the end of the line.

The doctor inquired why he did so.
"Oh," answered Paul, "I always like to be prepared.

In case this boat sinks I can easily find my baggage by means of this buoy which will float on the surface." This remark had not a very encouraging effect on the doctor.

That afternoon the voyage was resumed and they ran all night on a swift current.

Great danger and difficulty were experienced from the floating mills.