"It was all my own fault, of course," answered the major sadly. "But remember," he added, brightening up, "the thousand pounds is yours if you get that airship. I wouldn't touch a penny of Sir John's money."

"I'm not so fastidious, uncle. So, if I do bring down a 'Zep'—which isn't at all likely, I'm afraid—I'll have much pleasure in taking charge of the cash."

In due course Lawless reported himself at headquarters, confident that now he would at once be sent to the Front. In this, however, he was again doomed to disappointment; for, much to his chagrin, he was sent with his mechanic to test a new type of seaplane off the Irish coast.

"I've a good mind to chuck the Service altogether," he growled at the thought of that thousand pounds becoming more visionary than ever. Certainly there was not much chance of encountering a Zeppelin off the coast of Munster, which was where the tests were to take place.

It was a warm, misty dawn and the moisture-laden atmosphere was like that of a damp hothouse when Lawless arrived to start the trials. These occupied the whole morning, and at noon the Lieutenant decided on a "stand-easy" so that Cassidy might partake of the lunch he had brought with him. The Lieutenant had intended to share the repast, but that last volplane had been too much for him, and he had succumbed to his new enemy—air-sickness.

While Cassidy, whose stomach was as strong as a ship's boiler, consumed his lunch Lawless pondered over his very problematical chance of ever bringing down another Zeppelin. Suddenly his thoughts were interrupted by the flickering of the needle attached to the wireless apparatus. Bending over the instrument, he realised that it was recording an urgent message for help for some vessel in distress.

"S—S—S—S. Steamer Nimrod attacked by submarine," he read. Then followed the latitude and longitude of the ship's position, ending up with emergency call "S—S—S."

"Great Scot!" ejaculated the Lieutenant.

"Did ye speak, sorr?" asked Cassidy, with his mouth full of bread and cheese.

"Finish your grub, Mike; we've got a long flight in front of us," answered Lawless.