"What is Tam supposed to be doing?"

"He's watching the spotters. Tam will be down presently and we'll ask David how he came to meet Jonathan—this business has been going on for weeks."

Tam had received the recall signal. Beneath him he saw the two "spotters" returning home, and he waved his hand to his sporting companion and came round in a little more than twice his own length. He saw his strange friend's hand raised in acknowledgment, and watched him turn for the south. Tam drove on for a mile, then something made him look back.

Above his friend was a glittering white dragon-fly, and as he looked the fly darted down at the American tail.

"Missed him!" said Tam, and swung round. He was racing with the wind at top speed and he must have been doing one hundred and twenty miles an hour, but for the fact that he was climbing at the extreme angle. He saw the dragon-fly loop and climb and the American swing about to attack.

But his machine was too slow—that Tam knew. Nothing short of a miracle could save the lower machine, for the enemy had again reached the higher position. So engrossed was he with his plan that he did not see Tam until the Scot was driving blindly to meet him—until the first shower from Tam's Lewis gun rained on wing and fuselage. The German swerved in his drive and missed his proper prey. Tam was behind him and above him, but in no position to attack. He could, and did fire a drum into the fleeing foeman, but none of the shots took effect.

"Tairn him, Archie!" groaned Tam, and as though the earth gunners had heard his plea, a screen of bursting shrapnel rose before the dragon-fly. He turned and nose-dived with Tam behind him, but now his nose was for home, and Tam, after a five-mile pursuit, came round and made for home also. Near his own lines he came up with the circling "Frenchman" and received his thanks—four fingers extended in the air—before the signaler, taking a route within the lines, streaked for home.

"Phew!" said Tam, shaking his head.

"Who were you chasing?" asked Blackie. "He can go!"