Within the past few years the subjects of international peace and arbitration have come to have a place of importance in schools of all grades in the United States, and the interest in these subjects is increasing from year to year. As one means of fostering this interest many schools observe in a special way the 18th days of May, the anniversary of the assembly of the first Peace Conference at The Hague. On this day the schools give an hour or two to a program of addresses, readings, and recitations pertaining to the subject. Frequently addresses are made by prominent men and women of the community. Anything that gives effective help toward these programs is eagerly sought by teachers and school officers. A bulletin of the Bureau of Education entitled "Peace Day: Suggestions and Materials for its Observance in the Public Schools," issued last year, was called for to the extent of about 50,000 copies. There is now a demand for accurate and comprehensive information in regard to the various organizations and agencies working for international peace, as well as for suitable brief articles on the great principles of the movement, and for poems and quotations of an inspirational nature. This manuscript was prepared to meet this demand. Contents include: (1) Suggested program for the 18th of May; (2) Observance of Peace Day (Ferdinand Buisson); (3) The Opening of the Palace of Peace (A.P.C. Karnebeck); (4) Centenary of the treaty of Ghent; (5) To the teachers of the United States (Bertha von Suttner); (6) One hundred years of peace (W. D. Ainey); (7) The cosmopolitan movement (Louis P. Lochner); (8) Resolutions on peace passed by National Education Association, 1912; (9) A notable empire day circular; (10) Wars and their cost; (11) The Rush-Bagot agreement of 1817; (12) International arbitration treaties; (13) The Hague conferences; (14) The Hague tribunal; (15) The Nobel committee of the Norwegian Parliament; (16) International organizations for peace; (17) Selections for peace day; and (18) Quotations. A bibliography is included. Individual sections contain footnotes. [Best copy available has been provided.]