ms1790: Autograph letter signed, Rev Dr Thomas Guthrie to a Mr Blair. Advising him of his personal well-being. 32 Duncan Terrace, Islington, 5 May ny.
ms1859: Autograph letter, signed, Rev Dr Thomas Guthrie to an unknown recipient. Concerning the meaning of the word Huguenot. Edgill, 12 July 1855.
ms1860: Autograph letter, signed, Rev Dr Thomas Guthrie to an unknown recipient. Concerning Inspiration in Scripture. Edinburgh, 2 September 1855.
ms1861: Autograph letter, signed, Rev Dr Thomas Guthrie to an unknown recipient. Concerning the Sabbath question. Headed notepaper, Leven, 10 September 1856.
The content of ms1859 to ms1861 suggests the identification of J Gilfillan as the recipient. cf msBX9225.G5 (ms1862).