To the south I made out the Alps. Their glittering peaks projected up through the white sea about me like majestic icebergs. Not a single plane was visible anywhere, and I was growing very uncertain about my position. My splendid isolation had become oppressive, when, one by one, the others began bobbing up above the cloud level, and I had company again. We were over Belfort and headed for the trench lines. The cloud banks dropped behind, and below us we saw the smiling plain of Alsace stretching eastward to the Rhine. It was distinctly pleasurable, flying over this conquered land. Following the course of the canal that runs to the Rhine, I sighted, from a height of 13,000 feet over Dannemarie, a series of brown, woodworm-like tracings on the ground--the trenches! My attention was drawn elsewhere almost immediately, however. Two balls of black smoke had suddenly appeared close to one of the machines ahead of me, and with the same disconcerting abruptness similar balls began to dot the sky above, below, and on all sides of us. We were being shot at with shrapnel. It was interesting to watch the flash of the bursting shells, and the attendant smoke puffs--black, white, or yellow, depending on the kind of shrapnel used. The roar of the motor drowned the noise of the explosions. Strangely enough, my feelings about it were wholly impersonal. We turned north after crossing the lines. Mulhouse seemed just below us, and I noted with a keen sense of satisfaction our invasion of real German territory. The Rhine, too, looked delightfully accessible. As we continued northward I distinguished the twin lakes of Gérardmer sparkling in their emerald setting. Where the lines crossed the Hartmannsweilerkopf there were little spurts of brown smoke as shells burst in the trenches. One could scarcely pick out the old city of Thann from among the numerous neighbouring villages, so tiny it seemed in the valley's mouth. I had never been higher than 7,000 feet and was unaccustomed to reading country from a great altitude. It was also bitterly cold, and even in my fur-lined combination I was shivering. I noticed, too, that I had to take long, deep breaths in the rarefied atmosphere. Looking downward at a certain angle, I saw what at first I took to be a round, shimmering pool of water. It was simply the effect of the sunlight on the congealing mist. We had been keeping an eye out for German machines since leaving our lines, but none had shown up. It wasn't surprising, for we were too many.