But he did not want the man permanently injured. He knew now that Koku was so wildly excited that he might set upon O'Malley as he would upon an enemy in his own country.

"Koku! Stop! Wait for me!" Tom finally shouted.

Now the young inventor got no reply from the giant. Had the latter got so far ahead that he no longer heard his master's command?

Tom pounded on, working his legs like pistons, putting every last ounce of energy he possessed into his effort. This was indeed a desperate chase.

Chapter XXIII

Mr. Damon at Bay

Mr. Wakefield Damon was a very odd and erratic gentleman, but he did not lack courage. He was much more disturbed by the possible injury to Tom Swift's invention by this collision with the bumper at the end of the timber siding than he had been by his own danger at the time of the accident.

He did not understand enough about the devices Tom had built in the forward end of the locomotive cab to understand, by any casual examination, if they were at all injured. But when he climbed down beside the track he saw at once that the forward end of the locomotive had received more than a little injury.

The pilot, or cow-catcher, looked more like an iron cobweb than it did like anything else. The wheels of the forward trucks had not left the track, but the impact of the heavy locomotive with the bumper had been so great that the latter was torn from its foundations. A little more and the electric locomotive would have shot off the end of the rails into the ditch.