'i7,k2-dihydro- y-benzo-phenarsazin; and 7,12-dihydro- y-benzo-phenarsazin- ;'-sulfide. EVANSTON, ILLINOIS. ... [CONTRIBUTION FROM THE CHEMICAL LABORATORY OF THE UNIVERSITY OF ILLINOIS. ~f,@'-DICHLORO-DIETHYL ETHER. THE OXYGEN ANALOG OF MUSTARD GAS.' ... BY OLIVER KAMM AND JOHN E. WALDO. Received June 27, 1921. The simple analog of mustard gas in which the sulfur atom has been replaced by oxygen ...