At Geneva in 1925, representatives of 38 nations signed a protocol prohibiting chemical and biological warfare. For a complex of reasons, the U.S. Senate never ratified the agreement; but as the decades passed, more and more nations did. Today, 85 nations are parties to the Geneva Protocol—including Communist China, the Soviet Union, the other Warsaw Pact countries and every member of NATO except the U.S. To President Nixon's credit, he sent the Geneva Protocol back to Capitol Hill last year for ratification. There was just one hitch. With Nixon's message went a statement from Secretary of State William Rogers: "It...