Notice them in starting, and as often afterward as you can see them.

The appearance of trees varies with distance and point of view, and it is important that we shall be sure of our object trees and make no mistake about them." "All right, Captain Sam," cried the boys, "pick out your object trees." "Well," said Sam, "the big sycamore yonder will do for one, and that tall leaning pine away over there almost out of sight must do for the other.

That is in our line, and what we've got to do is to get to it.
It doesn't matter by how crooked a route, if we can remember the sycamore tree again and pick it out from there." "We'll watch 'em captain, and we won't let 'em slip away from us," said Sid Russell.
"Thank you, boys," replied Sam; "I shall be so busy picking our way, that I can't watch them very well.

Now then, we're ready, come on.".