11 Mar 1815 (Vol. 47, p. 115): Petition of Ephraim Leach & John Jackson [called brothers of Southworth Jackson later on same page] representing that the said Southworth Jackson is a person who is non compos Mentis, request a guardian.
13 Mar 1815 (Vol. 47, p. 115): Opinion of selectmen of Middleborough (Samuel Pickens, Thomas Weston, Seth Eaton Jun'r, William Nelson) that Southworth Jackson is non compos mentis & incapable of taking Care of himself.
25 Mar 1815 (Vol. 41, p. 209): To Ephraim Leach of Middleborough ... Blacksmith Greeting whereas it has been represented unto me by the Friends & Relations of Southworth Jackson of said Middleborough Labourer that he is non compos mentis & incapable to take Care of himself & Inquisitions thereinto having been made ... appoint you to be Guardian.