Files relating to the Ministry of Munitions Department of Trench Warfare, 1916-1917, concerning (fols. 1-95) development of chemical shells, 1916-1917, including discussion of requirements, German use of prussic acid/cyanide, animal testing of respirators, Stokes Smoke shells, physiological effects of gas, use of 'jellite' and phosgene, reports of the Chemical Advisory Committee and Porton Down Research Centre; (fols. 96-599) reports of the Chemical Advisory Committee, Mar. 1916-July 1917; (fols. 600-611) correspondence, Apr.-May 1916, with General Ducane and the Explosives Supply Department on supply of phosphorous for trench warfare; (fols. 612-645) gas reports for May/Oct. 1916 with correspondence from General HQ, France; (fols. 646-665) correspondence, 1916-1917, with William Livens discussing the Livens Projector and the Stokes Mortar.