The papers of Professor John Stuart Blackie consist largely of manuscript correspondence, mostly letters and at least one postcard, among them a letter to his publisher at Gen. 1733/100, a letter to the Aesthetic Club at Dc.2.58, a letter to Gibson at the Royal Society of Edinburgh at Dk.6.19/4, a letter denouncing English schoolmasters at Gen.1733/71, a letter about a dinner in honour of Faed, at Gen. 1730/1 Blackie, a letter to Sir C. J. Pearson at Gen. 756, no. 47, a letter with Blackie's favourite Greek motto at Gen. 1429/10/16, and a letter about Scottish music. Some letters are undated and it is uncertain to whom some of the correspondence is addressed. There are printed poems at Dc.4.101-103, and letters to several individuals between 1849 and 1887 at E89.73, E98.36, E98.47, and E98.55.
In addition there is a letter from Blackie to his nephew, possibly William Walker, a postcard to William Walker from his mother, and a copy of the Walker and Blackie family-tree at E2006.06.