"Yes, the air is very chill," returned Ned Rector solemnly. "Shouldn't be surprised if some one perished in this outfit."
CHAPTER XV
MAKING A STARTLING DISCOVERY
Stacy Brown looked from one to the other of his companions in disgust.
"Ho, ho! ho, ho!" he exploded. "Hard luck when a fellow's company is so thick that he has to laugh at his own jokes. Ho, ho, ho! Ha, ha, ha! It is to smile, but nobody smiles. You make me tired."
"As I have already observed, I think it is going to rain," said Tad.
"Must be getting warmer, then. A minute ago you said it was going to snow. It's my private opinion that you don't know what you think. Ned doesn't know any more. The professor is the only one in the outfit who has a sense of humor. He knows when it's time to laugh. Ha, ha!"
Professor Zepplin was smiling broadly. Stacy's joke was just dawning upon the professor. But Tad's mind at that juncture was in another direction. The lad had raised his head in a listening attitude, his glance fixed keenly on the other side of the camp ground.
"Did you see something?" whispered Walter.
Tad shook his head.