Letter listing for 1820–1829
- Sir John Frederick William Herschel, 1st baronet of Slough to Caroline Lucretia Herschel, 18 April 1825
- Clara Mary Jane Clairmont to Mary Wollstonecraft Shelley [née Godwin], 29 April 1825
- Clara Mary Jane Clairmont to Mary Wollstonecraft Shelley [née Godwin], 29 April 1825 [translation from French into English]
- Clara Mary Jane Clairmont to Jane Johnson [née Cleveland], 29 April 1825
- Caroline Lucretia Herschel to Sir John Frederick William Herschel, 1st baronet of Slough, 3 May 1825
- Clara Mary Jane Clairmont to Jane Johnson [née Cleveland], c. 16 May 1825
- Clara Mary Jane Clairmont to Jane Johnson [née Cleveland], 20 June 1825
- Sir John Frederick William Herschel, 1st baronet of Slough to Caroline Lucretia Herschel, after July 1825
- Margaret Chinnery [née Tresillian] to Caroline Stéphanie Félicité de Genlis, comtesse de Genlis [née du Crest de Saint-Aubin], 1 July 1825
- Caroline Lucretia Herschel to Johann Carl Friedrich Gauss, 8 September 1825
- Caroline Lucretia Herschel to Sir John Frederick William Herschel, 1st baronet of Slough, 20 September 1825
- Sir John Frederick William Herschel, 1st baronet of Slough to Caroline Lucretia Herschel, 28 September 1825
- Clara Mary Jane Clairmont to Jane Johnson [née Cleveland], 27 October 1825
- Sir John Frederick William Herschel, 1st baronet of Slough to Caroline Lucretia Herschel, 30 December 1825
- Reverend William Venables Vernon Harcourt to Sir Roderick Impey Murchison, 1826