"Ain't he got nerve, now?" the doctor appealed to Venetia, his eyes twinkling sardonically. "Any doctor would tell him for nothing that it was just plain murder to stick that needle into his lungs. If I am wrong, you know, he'd be a goner, bleed to death."

"I guess I ain't built very different from that guinea-pig," the man observed placidly. "And I have seen you put it into one of them often enough."

"Why don't you try it, if he's willing?" Venetia asked the doctor breathlessly.

Helen and Coburn laughed, and even the silent Hussey smiled grimly.

"Maybe, young lady, you wouldn't mind if I tried it on you! Can't you get up a real good heart trouble now?" the doctor quizzed.

"Would it make any particular difference if I hadn't anything the matter with me?" Venetia asked quickly. "You can put it into me and see what it does, anyway."

"Good nerve!" Coburn laughed admiringly. "See, Mrs. Hart, I've got two converts now. Don't you want to make a third?"

Then bursting into his loud laugh, which seemed to be directed at himself, Coburn walked to the rear of the room, raised a trap-door, and whistled for Pete. He thrust his hand down, caught the dog by the neck, and placed him on the laboratory table for exhibition.

"Nothing worse than a good aristocratic limp, Peter," the doctor pronounced with complacency. "Just come here and look at that ear, Venetia! What do you think of that? It isn't quite the right shade, but I couldn't lay my hands on a terrier that was as dark as Pete."

"What have you done to his ear?" the girl demanded.