=Storing Gas Masks.= Our masks, too, we believe can be kept for at least ten years. Experience to date indicates that rubber deteriorates mainly through the action of sunlight and moisture that cause oxidation or other change in the crystalline structure of cured rubber. Accordingly, we are putting up masks today in hermetically sealed boxes. It is thus evident that we can store a reserve of masks and gases in peace the same as other war materials. =Use of Gas by Gas Troops.= Now we come to the use of gas by special gas troops. In the war, Gas Troops used 4-inch Stokes’ mortars and 8-inch Livens’ projectors and in a very short time would have used a new portable cylinder for setting off cloud gas, using liquid gases, such as phosgene. They will use these same weapons in future wars. All of these are short-range weapons, but since the Livens’ bomb or drum contains 50 per cent of its weight in gas while the artillery shell contains 10 per cent, they have an efficiency away beyond that of artillery or any other method of discharging gas except cloud gas. They will, therefore, produce more casualties than any other method known for the amount of material taken to the front. These short-range weapons were developed by the British for trench use and not for open warfare, and yet our troops developed methods with the Stokes’ mortars that enabled them to keep up with many of the Infantry divisions. =Phosphorus and Thermit Against Machine Gun Nests.= The use of phosphorus and thermit against German machine gun nests by the Gas Troops is well known. How effective it was is not known to so many. Phosphorus and thermit were so used from the early days of the Marne fight in the latter part of July, 1918, to the very close of the war. There is no recorded instance where the Gas Troops failed to silence machine gun nests once the machine guns were located. In the future Gas Troops will put off the majority of all cloud gas attacks even with toxic smoke candles. =Necessity for Training in Peace.= This is an outline of the subject of chemical warfare. As stated in the beginning, the fundamental underlying principles for the successful use of poisonous gas is necessarily the same as for any other war materials. The necessity for continuous training in peace is just the same with chemical warfare as with the rifle, the machine gun, with field artillery or any other weapon of war. Indeed it is more so because the use of gas is so perfectly adaptable to night work. Men must be taught to take precautionary measures when so sleepy, tired and worn out that they will sleep through the roar of artillery.