The Tithe Applotments used Irish Acres. Griffith's Valuation used English or Statute Acres. One Irish Acre = 1.6 Statute acres. -Mike Sweeney Pam Gaudio wrote: > Last question. The Taughboyne Census of Townlands for 1821 - > Terrody is listed as having 105 Acres, 9 Houses, and 62 Inhabitants. > On the 1857 Griffiths Valuation, the Townland of Tirroddy is listed > as having 170 Acres and 8 Households. The number of households or > houses is not important to me, but the number of Acres in the Townland > is. Can anyone advise why there is a difference between 1821 of 105 > acres and 1857 of 170 acres.