They went into brigade reserve at Laventie on the 30th of the month, with genuine regrets, for the trenches that they had known so long. “We shall never be as comfortable anywhere else,” one boy wrote; and the C.O. who had spent so much labour and thought there lifts up a swan-song which shows what ideal trenches should be. “Handed over in November in a bad state, they are now as nearly perfect as a line in winter can be. The parapets are perfect, the fire-steps all wooden and in good repair. The dug-outs, or rather the little huts which answer to that name in this swampy country, their frameworks put up by the engineers and sand-bagged up by the infantry, are dry and comfortable. The traffic-trench, two boards wide in most places, is dry everywhere. Wherever trench-boards ran on sand-bags or mud they have been painted and put on piles. The wire in front of the line is good.” They were due for rest at Merville, farther out of the way of fire than La Gorgue, for the next week or so, but their last day in Laventie was cheered by an intimate lecture on the origin, nature, and effects of poison-gas, delivered by a doctor who had seen the early trials of it at Ypres. He told them in cold detail how the Canadians slowly drowned from the base of the lung upwards, and of the scenes of horror in the ambulances. Told them, too, how the first crude antidotes were rushed out from England in a couple of destroyers, and hurried up to the line by a fleet of motor ambulances, so that thirty-six hours after the first experience, some sort of primitive respirators were issued to the troops. The lecture ended with assurances that the ’15 pattern helmets were gas-proof for three quarters of an hour against any gas then in use, if they were properly inspected, put on and breathed through in the prescribed manner. Their only diversion at Merville was a fire in the local chicory factory close to the messes. Naturally, there was no adequate fire-engine, and by the time that the A.S.C. turned up, amid the cheers of the crowd whom they squirted with an extincteur, the place was burned out. “When nothing was left but the walls and some glowing timbers we heard, creeping up the street, a buzz of admiration and applause. The crowd round the spot parted, and in strode a figure, gaunt and magnificent, attired in spotless white breeches, black boots and gaiters, a blue jacket and a superb silver helmet. He was the Lieutenant of Pompiers, and had, of course, arrived a bit late owing to the necessity of dressing for the part. He stalked round the ring of urban dignities who were in the front row, shook each by the hand with great solemnity, stared gloomily at the remains of the house and departed.”