But--" He paused, whistling softly.
"Where is the third waterfall ?" "I thought we settled that last winter," replied Rod, a little irritated by his companion's doubt.

"If writing goes for anything, Ball was a man of education, and he drew the map according to some sort of scale.

The second fall is only half as far from the first fall as the third fall is from the second, which is conclusive evidence of this.

Now Mukoki discovered the first waterfall fifty miles down the chasm!" "And we figured from the distances between John Ball's marks on the birch, that the third fall was about two hundred and fifty miles from our old camp at the head of the chasm," rejoined Wabigoon.

"It looks reasonable." "It is reasonable," declared Rod, his face flushed with excitement.
"From the head of the chasm our trail is as plain as day.