for hunting in their veins, had borrowed an old shotgun and started forth. Without wasting any time in useless descriptions he quickly reached the point where the pigeon was shot.

Jack, having nothing to say just then, contented himself with watching the various shades of expression that flitted across the face of the commander. At mention of the pigeon his eyes sparkled, and he leaned forward with an air of expectancy, as though anticipating what would come next.

Then, as Tom produced the message written on the thin but tough paper and handed it to the general the French officer eagerly scanned it. Jack also noticed that he did not appear disappointed because he could not immediately read the baffling communication. Of course it would be written in some secret code; that was to be expected.

"It is fortunate," remarked the French officer, "that I have on my staff one who is considered an expert at solving any and every species of cipher code. He will speedily figure it all out for me, and then we shall see what news this spy was transmitting to his commander. Please continue your story, which is very interesting, and in which your part does you both credit."

Tom, thus encouraged, went on. He told of their further search for the mysterious man who had set the homing pigeon free after attaching the secret message to it.

When he presently told of coming on the ruined farmhouse, and discovering the ozier cage containing two additional pigeons, just where the spy had left them in his hurried flight, the general fairly beamed.

"It is splendid news you have brought me–you aviators from our sister republic across the sea," he remarked exultantly, as though already in his fertile mind he could see great possibilities looming up whereby those pigeons might be made to serve a purpose.

The story was soon finished. Tom, of course, thought it necessary to tell of having been fired on while on their way back to the aviation post, though no harm had resulted. He did this not for the purpose of impressing the general with the idea that they had run any great personal risk, but because it might have some influence on the plans the officer probably had in mind.

After all had been told the commander again shook hands with both of the air service boys. This indicated, as Tom well knew, that he had given them all the time he could spare and that a dozen important things were awaiting his attention, so he saluted and turned to depart.

"This may prove to be a most important thing you have discovered," the general halted the aviators to say warmly. "The cipher will be solved, and then, if the facts warrant it, we may have another written that can be sent forward by one of your birds. You will give them over into the charge of an officer whom I shall dispatch back with you to your quarters. That will be convenient, I suppose?"

Tom hastened to assure him that they had expected just such a thing, and had hoped that the two captured pigeons might prove the means of leading the Crown Prince's forces into some sort of trap.

The general's black eyes snapped on hearing Tom say this.

"Ah! I see that you too have thought it out!" he exclaimed enthusiastically. "Some day perhaps you may have command of an army, and exercise that talent with glorious success. France thanks you."

Both boys were deeply moved by their brief interview with the busy commander-in-chief of the French forces. They did not feel any humiliation at being addressed as "my children," knowing that it was a term of endearment used freely by officers high in command when addressing, those in the ranks. In fact, the French army is very much like a big family, the men loving those they serve under.

"Well, that job's over," remarked Jack, heaving a sigh of relief when they were on their way to their quarters, accompanied by a jaunty captain who, Tom believed, must be a member of the general's staff.

"I'm glad to have had such a fine opportunity for meeting General Petain," Tom returned, for the captain at the time was walking a little in the rear, conversing with a courier who had come running after him, as if on important business.

"He was fine, wasn't he, Tom?"

"Next to Joffre I understand General Petain is the most beloved commander the army has ever had," replied the other. "I'll always feel proud that he shook hands so heartily with both of us."

The air service boys were soon in the automobile that had carried them to the general's headquarters back of the French lines. Here the captain joined them, having finished his hasty consultation with the courier. On the ride to the aviation camp he chatted pleasantly with the young Americans. He, it appeared, had spent several years attached to the French Embassy at Washington.

He asked particularly concerning the feeling of the common people in America, and what influence the powerful cliques of naturalized but pro-German citizens were apt to have on the Government.

Tom was able to assure him that slowly but surely the people of free America were becoming aroused to the deadly menace of German imperialism, and that presently–it might come at any day, according to the latest advices–Congress would assemble to hear a ringing appeal from the President, urging them to declare war upon the Kaiser, war to the finish.

Apparently what the boys said had much in it to comfort the French captain. He knew only too well how eagerly his wearied nation was listening to hear just such a message of hope. He knew, also, just what it would mean for the brave defenders of France.

In due time the three arrived at the villa, Several of the American pilots saw the trio leave the car, wondered much what was in the wind that Tom and Jack should return with a member of General Petain's personal staff. Their curiosity was considerably heightened when later they saw the captain come out of the villa carrying a small ozier cage containing two blue-rock carrier pigeons, and effusively shake hands with both Tom and Jack, calling out to them as the car moved off:

"In the name of France and General Petain I thank you for what you have done this day, my brave Americans!"

As the chums were about to pass into the building there was a hail.

"Wait a minute, Jack!" called one of their fellow pilots, hurrying up with some object in his hand at which the two boys stared with rising curiosity. "I've got something here for you!"

"For me?" cried the youth addressed. "I'm ever so much obliged, but it strikes me I've got beyond the point of playing with a toy balloon; though honestly now, when I was a kid I used to be pretty fond of sailing one of 'em at the end of a long string, until it would get away, and leave me staring up while it climbed toward the clouds."

"Oh, this one is about past doing any climbing, I should say," replied the pilot, laughing at Jack's description of his childish woes. "In fact, it's been out during the night, and the heavy air forced it to come down. Listen, and I'll tell you a strange story that will make you believe in fairy tales."

"Go on then, please," urged Jack. "You've got me all worked up already. So there's a history attached to this little balloon, is there?"

"There was something attached to it, something that may mean much or little to you fellows," came the reply. "This thing was found by a French dispatch bearer on his way across country. Out of curiosity he stepped aside to look at the bobbing red object he had noticed among some bushes in an open field. When he found that it had a paper fastened to it, which on the outside had an address, he concluded to bring