“I guess that’s it, sir, and the carbide got wet from the rain that was just starting.”

“Why didn’t you put the fire out?”

“I tried to, but it roared so from the carbide and gas I got frightened,—and then the high wind did the rest,” answered Mason frankly.

“You say the fire came from the direction of Post 3?”

“Yes, sir.”

“Who was on that post?” asked the master of the school, turning to the other guards.

“I was,” answered Reff Ritter, after a pause.

“Did you see the fire, Ritter?”

“I—er—yes, sir—that is, after Mason spoke about it.”

“Where did it come from?”