The Arthur Twining Hadley Papers contain the official correspondence produced by Hadley during his tenure as President of Yale University (1899-1921). The papers are a valuable source for documenting a period in which the University, under Hadley's leadership, was undergoing rapid change and expansion. However, to fully document Hadley's activities as president, other sources must be consulted in conjunction with these papers, e.g., the minutes of the Yale Corporation, the records of the University Treasurer, and especially the papers of University Secretary Anson Phelps Stokes. The papers are arranged in three series:

• I INCOMING CORRESPONDENCE
• II OUTGOING CORRESPONDENCE
• III MISCELLANY

Series I, INCOMING CORRESPONDENCE, contains approximately 30,000 letters received by Hadley between 1899 and 1921. The bulk of this correspondence is of a routine, administrative nature. The letters generally fall into one of the following categories: correspondence with members of the Yale faculty and administration; requests for personal appearances, speeches, and articles; inquires from educational administrators asking how Yale deals with various problems; correspondence with alumni relating to fundraising and class reunions; requests from former students for recommendations; problems; letters from teachers seeking employment; correspondence from salesmen and people with schemes looking for a backer; crank mail.

For Hadley's responses to this correspondence see Series II, OUTGOING CORRESPONDENCE. To locate Hadley's reply to a specific piece of correspondence, the reader should note the penciled date on the letter"s right hand corner and then refer to the appropriate letter book in Series II.

Among the more significant correspondents, whose letters contain discussion of substantive issues, are:

• Adams, George B. (Professor of History, Yale) re: History Department activities
• Adams, Charles Francis re: comments on English view of Americans prior to World War I
• Anderson, William Gilbert (Director of the Gymnasium, Yale) re: University Gymnasium
• Angell, James Rowland re: University of Chicago and Carnegie Corporation business
• Angier, Roswell Parker (Professor of Psychology, Yale) re: Department of Psychology business
• Bakewell, Charles M. (Professor of Philosophy, Yale) re: Department of Philosophy business
• Baldwin, Simeon Eben (Governor of Connecticut; Professor of Law, Yale) re: Law School and general university business
• Beach, Harlan P. (Professor of the Theory and Practice of Missions, Yale) re: Student Volunteer Movement
• Beers, Clifford W. re: Connecticut Society for Mental Hygiene
• Bingham, Hiram (U.S. Senator, Connecticut; Professor of Latin American History, Yale) re: Yale Peruvian Expedition; general university business
• Blumer, George (Dean of the School of Medicine, Yale) re: National Committee for Mental Hygiene
• Boas, Franz re: Germanistic Society of America lectures at Yale; Foreign Service courses at Yale and Columbia
• Boltwood, Bertram B. (Professor of Physics and Chemistry, Yale) re: memoranda to Yale Corporation on the education of chemists at Yale
• Bozell, Harold V. (Assistant Professor of Electrical Engineering, Yale) re: formation of Signal Corps R.O.T.C. program at Yale
• Brandegee, Frank B. (U.S. Senator, Connecticut) re: acknowledging receipt of Hadley's opinions on bills in the Senate
• Brown, Charles R. (Dean of the Divinity School, Yale) re: Divinity School business
• Bumstead, Henry Andrews (Professor of Physics, Yale) re: Sloane Physics Laboratory
• Butler, Nicholas Murray re: Hadley's appointment as Roosevelt Professor of History at the University of Berlin
• Camp, Walter (Coach and Athletic Advisor, Yale) re: proposed changes in football rules
• Chittenden, Russell Henry (Director of Sheffield Scientific School) re: Sheffield business
• Cross, Wilbur L. (Governor of Connecticut; Professor of English, Yale) re: general university and English Department business
• Curtis, Edward Lewis (Dean of the Divinity School, Yale) re: Divinity School business
• Dana, Edward Salisbury (Professor of Physics, Yale) re: Physics Department business
• Day, George Parmly (Treasurer of the University) re: general university business
• Eliot, Charles William (President, Harvard University) re: Harvard-Yale relations; inter-collegiate football rules
• Graves, Henry Solon (Director of the School of Forestry, Yale) re: organization and curriculum of the School of Forestry
• Haldane, J.S. re: Silliman lectures for 1915
• Jones, Frederick S. (Dean of Yale College) re: library business
• Jones, Frederick S. (Dean of Yale College) re: library business
• Keller, Albert G. (Professor of the Science of Society, Yale) re: Department of Anthropology and Sociology
• Keogh, Andrew (.Yale University Librarian) re: library business
• Lowell, Lawrence A. re: Yale-Harvard relations
• McClung, (Thomas) Lee (Yale University Treasurer) re: university finance
• MacLeish, Archibald (Yale Class of 1915) re: request for recommendation to serve with the American Ambulance Service in France; discussion of MacLeish"s strong feelings towards his years at Yale and what the University means to him
• Oertel, Hanns (Professor of Linguistics and Comparative Philology; Dean of the Graduate School, Yale) re: Graduate School affairs
• Parkin, George R. re: Rhodes Scholarship Trust
• Philips, Andrew W. (Professor of Mathematics; Dean of the Graduate School, Yale) re: Mathematics Department and Graduate School business
• Pinchot, Gifford (Governor of Pennsylvania; Professor of "ForestryCnon- residentD, Yale) re: founding of the Yale University School of Forestry
• Rogers, Henry Wade (Dean of the School of Law, Yale) re: Law School business
• Roosevelt, Franklin Delano re: Yale Naval R.O.T.C. programs
• Root, Elihu re: William Dodge lectures 1906-07
• Royce, Josiah re: reply to Hadley's comments on Royce"s William James and and Other Essays on the Philosophy of Life and thanks to Yale Corporation for honorary degree
• Schwab, John Christopher (Professor of Political Economy and University Librarian, Yale), re: library business
• Stokes, Anson Phelps (Secretary of Yale University) re: routine correspondence on almost all facets of university administration
• Swan, Thomas Walter (Dean of the School of Law, Yale) re: Law School business
• Taft, William Howard (27th President of the U.S.; Professor of Law, Yale) re: personnel recommendations, letters of introduction, routine invitations and acknowledgements
• Toumey, James William (Professor of Silverculture, Dean of the School of Forestry, Yale) re: Forestry School business
• Weir, John Ferguson (Dean of the School of Fine Arts, Yale) re: School of Fine Arts business
• Welles, Mary C. (Ph.D. Yale, 1904; General Secretary of the Consumers League of Connecticut) re: Consumers League Annual Reports, advocate of child labor laws, education for children working in factories, minimum wage laws, women"s rights, and pure food laws. Attempted to get Hadley's support for a woman"s college in Connecticut
• Wilson, Woodrow (28th President of the U.S.; President of Princeton) re: personnel recommendations, routine acknowledgements, request that Hadley join conference on reform of football rules
• Winslow, C.E.A. (Professor of Public Health, Yale) re: public health education at Yale, routine School of Medicine business
• Wood, Leonard (Major General, U.S.A.) re: military training at Yale
• Wright, Henry Parks (Dean of Yale College) re: Yale College administrative business

An index of selected correspondents in Series I (Appendix I) follows the box listing for Series III. The names included in this index were selected on the basis of the person's eminence or connection with Yale, and for the significance of the information contained in the correspondence. In addition, the names of all persons who wrote Hadley ten or more letters were included.

Series II, OUTGOING CORRESPONDENCE, contains in letterbook form, carbon copies of Hadley's official outgoing correspondence from 1899 to 1921. Since Hadley responded to or acknowledged virtually every piece of incoming correspondence, the approximately 30,000 items in Series II includes much material of a routine nature. The letter books are arranged chronologically, with each volume preceded by an alphabetical name index.

Series III, MISCELLANY, contains the following material: subject files relating to R.O.T.C. and other military training programs; acceptances and regrets of invitations to Hadley's inauguration; newspaper clippings relating to Hadley's activities; copies of three addresses by Hadley; a notebook kept by one of Hadley's students in Economics 20 (1894-1895); Hadley's office appointment books (1900-1920); two photograph albums: one containing portraits of Hadley and members of his class at Hopkins Grammar School and the other containing photographs taken by Hadley and Henry Walcott Farnam, apparently in the western United States; a portrait of Mrs. James Hadley, Arthur Twining Hadley's mother.