front, for the hostile Arabs, knowing the mirage areas, would get into them and make ranging impossible. A transport column on the move through mirage is a curious sight. You see, across the plain, a long line of black dots, which are the wagons on the move. But apparently they are passing through the centre of a narrow lake, that runs in the same direction as their line of advance. The reflection in the lake is perfect in every detail and that is suspicious, for a train of wagons and horses crossing a shallow lake would stir up the water and disturb reflection. But there is another thing that helps you to recognise mirage. At the tail of the column rises a cloud of dust and here and there along the line you can make out a little wreath of dust rising apparently from the surface of the mirroring water. The fall of Kut did not ease the pressure at the hospitals. The sick rate was increasing steadily. The Shimal, the north-west wind that comes just in time to make it possible for you to believe in Providence, was not due until the middle of June. Down by the river-side, where the official meteorological station stood, the day temperature was far over 100 degrees, and up in the airless creeks, in the palm groves, it was much higher. Clinical thermometers cracked if they were left lying about on tables. Our staff was getting seriously depleted. No Tommy had to work so hard as those hospital orderlies, and it is not surprising that our casualties in sick men were very heavy. Clerks in the office became ward masters at a moment's notice. But in spite of all this the spirit of the place remained unshaken. However great the heat, it did not destroy that sense of humour which is the glory of the British Army. Rather be beaten and retain that sense than be victorious and lose it. And if you come to think of it, no man who retains his sense of humour is ever really beaten. VI THE DAY'S WORK