Green Cross (chemical warfare) The mixture was chlorine-phosgene, with 95% and 5%. Green Cross (chemical warfare) Green Cross (Grünkreuz) is a World War I chemical warfare pulmonary agent consisting of chloropicrin (PS, Aquinite, Klop), phosgene (CG, Collongite) and/or trichloromethyl chloroformate (Surpalite, Perstoff). Green Cross is also a generic World War I German marking for artillery shells with pulmonary agents (chemical payload affecting the lungs). The tip of the projectile with the fuse end painted green and a green cross at the bottom of the cartridge. Other Green Cross mixtures were based on phosgene and/or diphosgene. The first use of Green Cross was on May
Westward the Course of Empire Takes Its Way in the Rocky Mountains" that was part of the 1898 Trans-Mississippi Issue, and reprinted a century later. A Currier and Ives print from 1868 uses the same title and theme for a very different print, showing a railroad crossing a new settlement as the train goes west. A and a stereograph by Alexander Gardner, both of an 1867 end-of-track frontier construction train, were titled "Westward The Course of Empire Takes Its Way". David Foster Wallace named one of his short stories "Westward the Course of Empire Takes Its Way" in his 1989 collection "Girl with Curious Hair". Early revisions of