A few minutes down the line brought our machine to the sparkling Somme, the white town of Péronne, and the then junction of the British and French lines. We turned north-west and made for home. Passing over some lazy sausage balloons, we reached Albert. Freed at last from the intermittent shelling from which it suffered for so long, the town was picking up the threads of activity. The sidings were full of trucks, and a procession of some twenty lorries moved slowly up the road to Bouzincourt. As reminder of anxious days, we noted a few skeleton roofs, and the giant Virgin Mary in tarnished gilt, who, after withstanding bombardments sufficient to have wrecked a cathedral, leaned over at right angles to her pedestal, suspended in apparently miraculous fashion by the three remaining girders. We flew once more over a countryside of multi-coloured crops and fantastic woods, and so to the aerodrome. * * * * * Snatches of familiar flying-talk, unheard during the past ten days of leave, floated from the tea-table as I entered the mess: "Folded up as he pulled out of the dive--weak factor of safety--side-slipped away from Archie--vertical gust--choked on the fine adjustment--made rings round the Hun--went down in flames near Douai." The machine that "went down in flames near Douai" was piloted by the man whose puppy I had brought from England. CHAPTER VI. A CLOUD RECONNAISSANCE. Clouds, say the text-books of meteorology, are collections of partly condensed water vapour or of fine ice crystals. Clouds, mentioned in terms of the newspaper and the club, are dingy masses of nebulousness under which the dubious politician, company promoter, or other merchant of hot air is hidden from open attack and exposure. Clouds, to the flying officer on active service, are either useful friends or unstrafeable enemies. The hostile clouds are very high and of the ice-crystal variety. They form a light background, against which aeroplanes are boldly silhouetted, to the great advantage of anti-aircraft gunners. The friendly or water-vapour clouds are to be found several thousands of feet lower. If a pilot be above them they help him to dodge writs for trespass, which Archibald the bailiff seeks to hand him. When numerous enough to make attempts at observation ineffective, they perform an even greater service for him--that of arranging for a day's holiday. And at times the R.F.C. pilot, like the man with a murky past, is constrained to have clouds for a covering against attack; as you shall see if you will accompany me on the trip about to be described. * * * * *