The contents are as follows:

(i) Family correspondence, 1865-1905, undated (folio 1);

(ii) Letters, 1879-1886, of Sir William Fraser, chiefly concerning his genealogical researches (folio 112);

(iii) Letters, 1893, of Sir Henry Frederick Ponsonby concerning the battle of Fontenoy and Lord Charles Hay of Linplum (folio 152);

(iv) Letters, 1907-1912, of Charles Cleland Harvey concerning the college church of Bothans, Hay family pedigrees and other aspects of Hay family history to the 10th and 11th Marquesses of Tweeddale (folio 156);

(v) Letters, 1916-1967, chiefly to the 11th Marquess of Tweeddale concerning Hay family history (folio 158).