There, listen!" "Wind in the trees." "No, I'm sure it is not!" I exclaimed.

"There! it is gone now.

It is like far-off thunder." "Water," said the doctor, who had closed up with us unperceived.

"I've been listening to it, and it sounds to me like a waterfall.

Depend upon it we shall find that the river comes down over some pile of rocks, and if we were clear of the forest and could take a good look round we should find that the country is growing mountainous on ahead." It seemed during the next day's journey that the doctor was right, for we were certainly ascending, the land growing more rugged and toilsome, but at the same time far more beautiful and full of variety.