1. William Laing to James Beattie, 19 December 1790, AUL MS 30/2/636.
2. James Beattie to Robert Arbuthnot, 9 July 1792, AUL MS 30/1/332.
3. James Beattie to Robert Arbuthnot, [ca. 10 August 1792], AUL MS 30/1/330.
4. George Skene to Joseph Black, 25 March 1773, EUL GB 0237 Joseph Black Gen. 873/I/55–56.
5. James Beattie to William Laing, 25 June 1771, NLS Acc. 4796, Fettercairn Box 91.