So that if--" He broke off.

"By-the-by," he said, "do you remember whether I said the bisecting line of that segment pointed to the north or to the south ?" "You said it pointed to the north," replied George.
"Are you positive ?" persisted Harris.
"Positive," answered George "but don't let that influence your calculations.

In all probability you were wrong." Harris thought for a while; then his brow cleared.
"That's all right," he said; "of course, it's the north.

It must be the north.

How could it be the south?
Now we must make for the west.