The contents are as follows:

(i) Letters, 1748-1765, of Frances, Marchioness of Tweeddale (folio 1);

(ii) Letters, 1763-1775, of James Hay, Writer to the Signet (folio 81);

(iii) Correspondence, 1771-1776, of Lady Catharine Hay with her uncle, the 6th Marquess of Tweeddale, her mother, Frances, Marchioness of Tweeddale, and her husband, Major William Hay (folio 141);

(iv) Miscellaneous family correspondence, 1763-1787, including letters of Captain David Hay, Royal Navy, Edward Hay of Newhall, the 5th and 7th Marquesses of Tweeddale and Lady Grace Hay (folio 200).