A General came round this morning. He said the Canadians and another regiment had given the Germans what for for this gas-fumes business north of Ypres, got the ground back and recovered the four guns. The beasts of Germans laid out a whole trench full of Zouaves with chlorine gas (which besides being poisonous is one of the most loathsome smells). Of course every one is busy finding out how we can go one better now. But this afternoon the medical staffs of both these divisions have been trying experiments in a barn with chlorine gas, with and without different kinds of masks soaked with some antidote, such as lime. All were busy coughing and choking when they found the A.D.M.S. of the ---- Division getting blue and suffocated; he'd had too much chlorine, and was brought here, looking very bad, and for an hour we had to give him fumes of ammonia till he could breathe properly. He will probably have bronchitis. But they've found out what they wanted to know--that you can go to the assistance of men overpowered by the gas, if you put on this mask, with less chance of finding yourself dead too when you got there. They don't lose much time finding these things out, do they? On Saturday I shall be going on night duty for a month. _Monday, April 26th,_ 11 P.M.--We have been admitting, cutting the clothes off, dressing, and evacuating a good many to-day, and I think they are still coming in. There is a great noise going on to-night, snapping and popping, and crackling of rifle firing and machine-guns, with the sudden roar of our 9.2's every few minutes. The thundery roll after them is made by the big shell bounding along on its way. Two officers were brought in last night from a sap where they were overpowered by carbon monoxide. Three of them and a sergeant crawled along it to get out the bodies of another officer and a sergeant who'd been killed there by an explosion the day before; it leads into a crater in the German lines, and reaches under the German trenches, which we intended to blow up. But they were greeted by this poisonous gas last night, and the officer in front of these two suddenly became inanimate; each tried to pull the one in front out by the legs, but all became unconscious in turn, and only these two survived and were hauled out up twenty feet of rope-ladder. They will get all right. The wounded ones are generally in "the excited stage" when they arrive--some surprised and resentful, some relieved that it is no worse, and some very quiet and collapsed. Captain ---- showed me his periscope to-day; you bob down and look into it about level with his mattress, and then you see a picture of the garden across the road. He has seen one made by Ross with a magnifying lens in it so good that you can see the moustaches of the Boches in it from the bottom of your trench. The noise is getting so beastly I must knock off and read 'Punch.'