Another name for Mary was Polly Mason.
per K. Beals: History of Unity, NH
Mary married Samuel Straw, son of Daniel Straw and Eunice Hadley. (Samuel Straw was born about 1783 in Grantham, Sullivan County, New Hampshire and died on 21 Apr 1863 in Unity, Sullivan County, New Hampshire.). The cause of his death was "gravel" [kidney stones].