Professor Paulsen gave his colleague's chin-whiskers a savage jerk.
"I want the truth!" he rapped. "Hurry up! Tell me!" He jerked again.
"Oh! Ow! Joseph, please! Oh, let me go! I'll tell—"
"You bet you'll tell!" grated his friend. "It's one thing to let you get away with making a fool of me. But when it comes to tampering with the United States Army—" And then, breaking off: "All right. Why did you jump so when I mentioned the spy was believed to have red hair?"
"Well...." Henry squirmed some more. He tried hard to look dignified despite the professor's grip on his goatee, but failed miserably.
"Out with it!"
"It's really nothing, Joseph—"
"Out with it, I say!"
"Ow! Joseph, stop!" And then: "It's just ... the man who bought my X-ray glasses had red hair—"
"The man who bought your X-ray glasses!"