Slowly the airship arose, almost too slowly to suit those on board who anxiously watched the oncoming officers. The latter had drawn their short swords, and at the sight of them Mr. Damon cried out: "Bless my football! If they jab them into the gas bag, Tom, we're done for!" "They won't get the chance," answered the young inventor, and he spoke truly, for a moment later, as the big propellers took hold of the air, the Falcon went up with a rush, and was far beyond the reach of the men. In a rage the spy shook his fist at the fast receding craft, and one of the policemen drew his revolver. "They're going to fire!" cried Ned. "They can't do much damage," answered Tom coolly. "A bullet hole in the bag is easily repaired, and anywhere else it won't amount to anything." The officer was aiming his revolver at the airship, now high above his head, but with a quick motion the spy pulled down his companion's arm, and they seemed to be disputing among themselves. "I wonder what that means?" mused Mr. Damon. "Probably they didn't want to risk getting into trouble," replied the Russian. "There are strict laws in France about using firearms, and as yet we are accused of no crime. We are only suspected, and I suppose the spy didn't want to get into trouble. He is on foreign ground, and there might be international complications." "Then you really think he was a spy?" asked Tom. "No doubt of it, and I'm afraid this is only the beginning of our trouble." "In what way?" "Well, of course word will be sent on ahead about us, and every where we go they'll be on the watch for us. They have our movements pretty well covered." "We won't make a descent until we get to Siberia," said Tom, "and I guess there it will be so lonesome that we won't be troubled much." "Perhaps," admitted the Russian, "but we will have to be on our guard. Of course keeping up in the air will be an advantage but they may--" He stopped suddenly and shrugged his shoulders. "What were you going to say?" inquired Ned. "Oh, it's just something that might happen, but it's too remote a possibility to work about. We're leaving those fellows nicely behind," he added quickly, as though anxious to change the subject. "Yes, at this rate we'll soon be out of France," observed Tom, as he speeded the ship along still more. The young inventor wondered what Mr. Petrofsky had been going to say, but soon after this, some of the repaired machinery in the motor room needed adjusting, and the young inventor was kept so busy that the matter passed from his mind.