THE SHAME AND OBLOQUY of introducing poison-gas as a weapon in modern war must rest for ever with Germany, who, in spite of, or perhaps, because of, her signed agreements not to use gas, attacked the Allied line in the neighbourhood of Ypres on April 22 1915 in a chlorine gas cloud. Poison-gas, now one of the deadliest and most dreaded weapons of modern war, is not, as popularly held, an entirely new method of warfare. Poisonous fumes were used in warfare centuries before the rifle or shell were thought of.