"Indeed, you're welcome to leave it there without pay," was the answer. "I'm interested in airships, and I'll consider it a favor if you'll let me look yours over while it's here."
Tom readily agreed, and a few minutes later he had caught a trolley going into the city. He was soon in one of the largest jewelry stores of Chester.
"I'd like to get an expert opinion as to whether or not those stones are diamonds," spoke Tom, to the polite clerk who came up to wait on him, and our hero handed over the two gems which Mr. Jenks had given him. "I'm willing to pay for the appraisement, of course," the young inventor added, as he saw the clerk looking rather doubtfully at him, for Tom had on a rough suit, which he always donned when he flew in his monoplane.
"I'll turn them over to our Mr. Porter, a gem expert," said the clerk. "Please be seated."
The young man disappeared into a private office with the stones, and Tom waited. He wondered if he was going to have his trouble for his pains. Presently two elderly gentlemen came from the little room, on the glass door of which appeared the word "Diamonds."
"Who brought these stones in?" asked one
