Letter listing for 1840–1849
- Caroline Lucretia Herschel to Sir John Frederick William Herschel, 1st baronet of Slough, 4 August 1842
- Sir John Frederick William Herschel, 1st baronet of Slough to Caroline Lucretia Herschel, 9 August 1842
- Clara Mary Jane Clairmont to Sir Percy Florence Shelley, 3rd baronet, 23 August 1842
- Clara Mary Jane Clairmont to Mary Wollstonecraft Shelley [née Godwin], c. 22 November 1842
- Sir John Frederick William Herschel, 1st baronet of Slough to Caroline Lucretia Herschel, 8 December 1842
- Lady Margaret Brodie Herschel [née Stewart] to Caroline Lucretia Herschel, 12 January 1843
- Caroline Lucretia Herschel to Lady Margaret Brodie Herschel [née Stewart], 1 March 1843
- Clara Mary Jane Clairmont to Mary Wollstonecraft Shelley [née Godwin], c. 6 April 1843
- Sir Roderick Impey Murchison to Reverend William Venables Vernon Harcourt, 7 April 1843
- Reverend William Venables Vernon Harcourt to Sir Roderick Impey Murchison, 11 April 1843
- Sir Roderick Impey Murchison to Reverend William Venables Vernon Harcourt, 12 April 1843
- John Phillips to Reverend William Venables Vernon Harcourt, 22 April 1843
- Caroline Lucretia Herschel to Sir John Frederick William Herschel, 1st baronet of Slough, 23 April 1843
- Caroline Lucretia Herschel to Sir John Frederick William Herschel, 1st baronet of Slough, 4 May 1843
- Caroline Lucretia Herschel to Lady Margaret Brodie Herschel [née Stewart], June 1843