text:  <unk> remained active in the administration of Harvard , and was active in a number of organizations , including the American Academy of Arts and Sciences and the Massachusetts Historical Society ( whose president he was from 1806 to 1818 ) . He was also elected a member of the American <unk> Society in 1814 . <unk> spent most of his later years at his country estate in <unk> , suffering from worsening <unk> <unk> that made walking increasingly difficult . His declining health and lack of social scene in <unk> led him in 1822 to return to Boston in the winters . He died on March 1 , 1827 in Boston and is buried in its <unk> <unk> Ground . 
  