Include affidavits testifying to the excellence of the College of Agriculture at Cornell University prepared by Arnold and P. B. Crandall, and a letter from William C. Russel instructing Arnold on the preparation of his affidavit, 1874; a letter from Horatio Seymour to Arnold on the possibility of preparing a cheese suitable for Army use, 1878; and a letter from William C. Young thanking Arnold for his speech before the British Dairy Farmers Association, 1886.

Early papers of William C. Russel and letters of his mother Lucy Channing Russel; other family letters; three letters written by William C. Russel, two to Augustus J. Rogers concerning coeducation and the Physics Department at Cornell University, and one letter to George Bowen; letters of support for Russel during the crisis at Cornell, 1881, including two letters of Andrew Dickson White; financial records; legal papers; and two photographs.