But to return to the case in hand. I was fast becoming blinded by the moisture on my "windows." I now followed the instructions of my teacher, and brought out my "window-cleaner," the preparation which each man carries for thoroughly cleansing his goggles. Leaving the nose firmly held and continuing my strong bite on the mouthpiece, which is not unlike the mouth-hold in a football nose-guard, I pulled the bands off my head, the mask away from my cheeks, and with the speed of desperation cleansed the two glasses. After readjusting the mask, to free it from any possible gas I used the method described above. Nearly an hour had passed. "All clear," came the cry, and again the hand-siren sounded. The reader cannot imagine the relief with which I uncovered my face. The men went quietly to their places; it was now apparent that the real seat of the trouble, whatever it was, had been located some distance away. In the morning we learned that only a "trace" of the gas had reached our high ground. The batteries continued their intense firing, but again we stretched out in our bunks. I had just covered myself when the warning came again, "Gas! Gas! Gas!" and for another thirty minutes I stood at attention. But after the second alarm our relief was permanent. I then made a record of the exact number of minutes the mask was in service, and turned in, to remain undisturbed until morning. This record, for which special charts are provided, is absolutely essential. The chemical in the British mask (box respirator) is good for forty-eight hours. The can containing the chemical is then exchanged for a new one. The mask itself, with proper treatment, lasts for a long time. While the more quickly adjusted, but far less reliable, French mask is also carried by our men, the British mask is chiefly relied upon. It is complete protection against every gas thus far developed; and the scientific men of the Allies are daily lessening the fiendish menace of gas. The spirit of the men who face the poison is expressed by Corporal Harold Hall of Bridgeport, Conn. In a letter to his mother he says: "We were under a heavy gas for four hours, and, to tell the truth, I'm glad we were, as I was always afraid of gas. But now that I've been through a good gas attack I don't fear it at all, as there is absolutely no danger if a fellow is on the alert and not careless. Oh, this isn't such a terrible war, after all. We are used to it, and do not mind it near so much as you people at home do."