Sir Archibald Geikie corresponded with a number of people both socially and professionally. This sub-series includes the following correspondents:

Duncan M Irvine (fl1876-1898) wrote from Scotland concerning aspects of surveying work, including references to shale, and from Canada concerning geological research taking place there.

Robert Logan Jack (1845-1921) related discoveries of old canoes and crannogs and many geological obsevations made while surveying and mapping in Scotland. He moved to the Geological Survey of Queensland c1877 and wrote about the nature of working there, including references to the gold fields. He subsequently wrote from near Paris regarding work he was to do in China.

Sir Henry James (1803-1877), director general of the Ordnance Survey, wrote regarding geological survey work undertaken by Geikie, publications by Geikie and about his own resignation.

John Gwyn Jeffreys (1809-1895) wrote about European geologists.

Sophia Louisa Jex-Blake (1840-1912) wrote on social matters.

Alexander Keith Johnston (1804-1871), or his son Alexander Keith Johnston (1844-1879), cartographers, wrote to Geikie about maps, their publication and supply.

Thomas Rupert Jones (1819-1911) wrote regarding Sir Archibald Geikie becoming professor at Edinburgh University. He also supplied Geikie with information on Sir Roderick Impey Murchison, on portraits held by the Geological Society and discusses various aspects of geological research and publications.

Alfred John Jukes-Browne (1851-1914) wrote regarding aspects of their work within the Geological Survey, including proposed survey work and professional issues within the organisation. More specific aspects of geology itself are mentioned, including rock types and geological time. Publications are also referred to.