The professor placed his ear against the breast of the unconscious man. "There is still a spark of life," he remarked. "Perhaps I can save him. I will try my electric remedy." He got up and hurried to the house. Mr. Henderson had invented a number of medical appliances, not the least of which was an affair, different from an electric battery in that it allowed a current to be administered internally. It was this that he now decided to try on the unfortunate German. He came back in less than a minute with a curious machine. It was shaped like a box, but on the outside had a number of shiny knobs, and several wires ending in brass handles. Professor Henderson placed a brass handle in each of the palms of the German, directing Mark and jack to hold them there. Then he placed several of the shining knobs at the back of his head, and ran a long wire around his waist. "Now, Andy," ordered the inventor, "if you will take hold of this rod and place the end of it on his tongue when I open his mouth, I think we may be able to revive him." This was done, and Mr. Henderson turned on the current. There was a buzzing sound from the box, and a slight tremor was visible throughout the whole body of the unconscious man. "It is beginning to work!" exclaimed the professor. "He is coming to!" Mr. Roumann opened his eyes. "Take the rod from his tongue, Andy," directed Mr. Henderson. The hunter did so, and the German, looking curiously about him, asked: "Is the projectile damaged?" "It doesn't seem to be," replied Jack quickly. "Are you much hurt?" asked the professor. Mr. Roumann passed his hand slowly across his head. "I feel rather strange here," he said. "There seems to be some injury." Mark silently pointed to the cut. Mr. Henderson quickly examined it. "The skull is not injured," he announced. "It is merely a scalp wound. Wait a moment now and I will give you something to make you feel better." From a small pocket case he took a spoon and a bottle. He poured out a strong-smelling liquid, and administered a few drops to the German. The latter's pale face at once became flushed. "I think you will be all right now," said Mr. Henderson. "But it was a narrow escape. Do you feel well enough to let us take you to the house?" "I think so. But guard the shop well. That crazy machinist came back, and some one was with him. Then came an explosion--and I don't remember any more." "I'll guard the place!" exclaimed Andy. "And if any of those chaps come around--well, they'll wish they hadn't," and he looked significantly at his gun. Mr. Roumann was getting better every moment, and was soon able to stand. He was assisted to the house, where Mr. Henderson attended to the injury on his head. Then, after some more medicine had been administered, and the electric remedy had been applied again, the German announced that he felt almost as good as ever, except for an aching head.