Age 100, of Elmira, NY, died on October 8, 2009 in Elmira, NY 100 years after her birth on October 8, 1909 in Buffalo, NY to James H. and Margaret D. Arbuthnot. Margaret was predeceased by her husband, Dr. Earle Griff Ridall, daughter, Eleanor Arbuthnot Ridall Slocum, granddaughter, Sarah Elizabeth Slocum Hamley, sons in-law, Thomas Henry and William Davis. She is survived by daughters, Elizabeth Henry of Camden, ME, Margaret Davis of Big Flats, NY, Dr. Amy Ridall of Houston, TX and son Theodore Ridall(Sue) of Pine City, NY, grandson, Jeffrey Slocum, great grandson, Gabriel Slocum; of O'Fallon, IL, granddaughters, Bernadette Gordon (Josh) of Corning NY, and Susan Fowler (David), great grandsons, Thomas and Zachary Fowler of Allen, TX.Margaret graduated in 1930 from the university of Buffalo with a Bachelor of Arts degree in psychology. While her children were young, she was active in volunteer work with the Children's Theater. Community Ambassador, Girl Scouts, and the Experiment in international Living. In later years she was the genealogist of the North American Arbuthnot Family Association, compiling and producing several large books of material on twenty Arbuthnot lines. In her later years Margaret was lovingly cared for by the staff at Woodbrook and 4-D at Arnot Ogden Medical Center; and the family is grateful for their help. It was Margaret's request that there be no formal funeral service and those wishing to remember her may contribute to the Arnot Ogden Memorial Foundation, 4-D Unit, 600 Roe Avenue, Elmira, NY 14905. Arrangements entrusted to Olthof Funeral Home, Inc.