"That’s awkward. You can’t pilot and work the wireless too." "Perhaps not, but if I can spot the battery I can return with my observer to-morrow, and then we’ll be able to set you to work on it." "Good! You’ve seen what we can do." "Well, not exactly seen; but apparently it wasn’t a pigsty this time. Look out for me in an hour or so." He returned to the house, remounted, and rode back rapidly to the aerodrome. There he explained the circumstances at greater length to his flight commander, set the mechanics to work, and within ten minutes was ready to start. "We’re in for a storm, I fancy," said his commander as he got into his place; "but perhaps you’ll be back before it breaks." The weather had gradually changed. The sky had become thick, the air was sultry and oppressive. As Burton climbed in a wide spiral it was like going from a Turkish bath into the cooling room, fresh and exhilarating. He circled over the aerodrome until he had attained an altitude of six or seven thousand feet, then steered towards the German lines, still rising steadily. The spot for which he was making was four or five miles away. Soon the bewildering network of the British trenches glided away beneath him. Then the German trenches came into view. On the roads behind he noticed tiny black specks moving this way and that--supply wagons, no doubt, or motor-cars bringing up fresh men. The whirr of his engine was broken into by something like the sound of a pop-gun. He looked around; a woolly ball of smoke hung in the air on his right. Immediately afterwards there were more pops, and the ball became the centre of a cluster. Burton swerved to the left, then dodged a long roll of greenish-yellow smoke with a red tongue of flame in the centre. The German "Archies" were at work. He flew on, swinging from side to side, until he calculated that he was about three miles behind the front line of trenches. Then he turned at right angles and commenced a methodical search of the ground stretched like a patchwork quilt below him. Here was a brown patch of plough-land, then a blob of vivid green denoting grass, or one of green speckled with white--an orchard in the blossom of spring. In the distance the silvery streak of a river pursued its winding way. A train was rolling across it, like a toy train on a toy bridge. A dark mass below him broke apart, resolving itself into individual dots. "Afraid of bombs," he thought. At the spot where the centre of the crowd had been, the ground appeared to be blackened. "Shouldn’t wonder if that’s the missing aeroplane," he thought. "It caught fire, or they’ve burnt it. But where’s that new battery? Things are getting hot." Shells were bursting all about him. Now and then the machine lurched, and he looked round anxiously to see the extent of the damage. A few wires, perhaps, were hanging loose; a few rents gaped in the fabric; nothing serious as yet. But it was getting very uncomfortable.