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

Sir Arthur William Rücker (1848-1915) asked Geikie's advice on preparatory schools. He related work he had done on magnetic fields with Dr Thorpe and asked about granite in Scotland.

John William Salter (1820-1869) wrote during work and retirement relating his work and personal life philisophically. He mentioned his paper on Old Red Sandstone he had written (1863).

Dukinfield Henry Scott (1854-1934) wrote to ask Geikie's opinion of a fossil found on Mull by Sir William Turner Thiselton-Dyer (1843-1928).

Robert Henry Scott (1833-1916) wrote regarding the supply of maps to Geike from the Meteorological Office.

John Scouler (1804-1871) wrote on the subject of tusks and informed Geikie of some findings which had been made by a Dr Cooper. He also related other findings.

John Campbell Shairp (1819-1885) wanted Geikie to write something for the Scotsman on Life and letters of James David Forbes, F.R.S. , ( 1873) , which had just been published. Geikie was also to be reviewing it for Blackwoods Magazine.

Harriman Skae (fl1872-1879) worked for the Geological Survey in Scotland and wrote about work he was doing in various parts of the country.

Sydney Barber Josiah Skertchly (1850-1926) wrote concerning books he had published on geology and physical geography.

James Smith (1782-1867) specialised in glacial questions and wrote to Geikie on the subject of glacial deposits and to offer his assistance to Geikie's brother, James Geikie (1839-1915)