You will remember how, months ago, our machine landed on an abandoned trench, after being damaged in a scrap? A bullet through the petrol-pipe having put the carburettor out of action, the engine ceased its revs., so that we glided several miles, crossed the then lines at a low height, and touched earth among the network of last June's lines. We pancaked on to the far edge of a trench, and the wheels slid backward into the cavity, causing the lower wings and fuselage to be crumpled and broken. My left knee, which has always been weak since a far-back accident, was jerked by contact with the parapet. Next day it seemed none the worse, so I did not take the accident seriously. During the weeks and months that followed the knee was painless, but it grew larger and larger for no noticeable reason, like Alice in Wonderland and the daily cost of the war. Then an aggressive lobster, eaten in Amiens one fine evening, revenged itself by making necessary a visit to the casualty clearing station for attention to a mildly poisoned tummy. The doctor who examined me noticed the swollen knee, and looked grave. He pinched, punched, and pressed it, and finally said: "My dear boy, why the devil didn't you report this? It's aggravated synovitis, and, if you don't want permanent water-on-the-knee, you'll have to lie up for at least three weeks. I'll have you sent to the Base to-morrow." My ambition did not yet soar beyond a short rest at the Base. Meanwhile it was pleasant to lie between real sheets and to watch real English girls making beds, taking temperatures, and looking after the newly wounded with a blend of tenderness and masterful competence. Their worst job appeared to be fighting the Somme mud. The casualties from the trench region were invariably caked with dirt until the nurses had bathed and cleaned them with comic tact and great success. It being the day of an advance, scores of cases were sent to Gezaincourt from the field dressing stations. Each time an ambulance car, loaded with broken and nerve-shattered men, stopped by the hospital entrance, a young donkey brayed joyously from a field facing the doorway, as if to shout "Never say die!" Most of the casualties echoed the sentiment, for they seemed full of beans and congratulated themselves and each other on their luck in getting Blighty ones.