"What is it, Will?" asked Boyd anxiously.
"Smoke! A big puff of it!"
"And it came from the top of that mountain to the east of the valley."
"It rose straight and fast, as if it had been sent up by some human agency."
"And so it was. It's a signal!"
"Indians!"
"Yes, Will."
"What does it mean?"
"It means 'Attention, watch!' They've got a code almost as complete as that of our armies when they use the signal flags. Look at that other crest off to the north. Maybe an answer will come from it."
"There is an answer. I can see it rising now from the very place you indicate, Jim. What does the answer signify?"