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This manual describes the physical and chemical nature of certain poison gases, their uses in war, the symptoms caused by them, their recognition and the treatment of the lesions produced. The gases are grouped into vesicants, lethal gases, harassing gases and accidental gases. Of the vesicant or blister gases the mustard gas was the most effective chemical agent used in the war of 1914-1918. The fact that there is no immediate irritation of the skin on contact with the liquid or of the eyes or the respiratory tract constitutes one of the more serious dangers of this gas, as contamination may be unsuspected. Signs and symptoms do not begin to appear until after the lapse of some hours, depending on the concentration of the vapor in the atmosphere and the duration of exposure. Contamination of the eye by a spray or a splash represents one of the gravest dangers in
Medical Manual of Chemical Warfare, 1940 [including] "An Atlas of Gas Poisoning.". JAMA. 1941;116(20):2351. doi:10.1001/jama.1941.02820200121034
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