“That you told him to go in there to experiment.”

“That was untrue!” cried Tom.

“So I guessed. So I took the liberty of putting a new lock on the place—a lock that fellow couldn’t pick if he wanted to, and he came at me hot and heavy. We had a quarrel, and I’m glad you’re here to settle it.”

“And I’ll settle it mighty quick!” exclaimed Tom. He was in his private office now, in a part of the shop somewhat removed from his secret experimental laboratory. Pushing a button that summoned a messenger, Tom bade the boy send Greenbaum in. And when the man sauntered in, smiling and seeming very confident of himself, the young inventor said:

“Get your time from the cashier and pack your things.”

“What for?” demanded Greenbaum, with a quick change of countenance.

“Because you’re through here.”

“Through, Mr. Swift! Why, you gave me a contract and you can’t fire me off-hand this way without telling me why! It isn’t fair!”

“It’s fair enough, and you know it!” declared Tom. “The only contract you had was that I said I’d keep you as long as your work was satisfactory. Well, it isn’t. It’s far from satisfactory.”

“You mean on that magnetic gear shift? I can show you, Mr. Swift, that——”