This collection houses letters that Agur Castle's family and friends in England sent to him before and after his emigration to America. The vast majority of the correspondence was authored by Agur's brother David, then living in Stalybridge, England. Most of the letters discuss family business (including the deaths of numerous children and friends) and request news of relatives in the United States and Canada, but some mention a coal strike, English immigrants' impressions of America and the American Civil War, and European politics (including news of the Crimean War).