"That isn't English!" put in Jack. "That's French!"
"What Patrol does he belong to?" asked Jimmie. "Look for his mark. If he's a friend of ours he'll put that in, too."
"Here's a picture of a Hawk's head. Maybe that's his Patrol. And then here are some other marks that indicate his rank, no doubt!"
"He makes a pretty good picture of 'Signs in Stones!'" was Jack's comment. "Three stones piled one on top of another. That's a neat picture. Why," with a startled glance around, "that's 'Danger!'"
"Correct! Go to the head of the class!" decided Jimmie.
"I vote we get going somewhere!" put in Harry, moving around the end of the planes. "Hello!" he added, stumbling over an object on the ground. "Guess my eyesight is poor! I didn't see those stones!"
"Take another look!" advised Jimmie. "Weren't they piled on top of each other? I thought I saw the pile just as you kicked it!"
"Guess they were," admitted Harry. "Who did that, I wonder?"
"Maybe The Hawk did it," Jimmie suggested from his perch in the aeroplane. "It would be just like him to add that to the note."
"Hello!" cried Ned, as he examined the ground near Harry's position. "There's another little pile of three stones!"