Croll, James, 1821-1890 (physical geologist and Keeper of Maps and Correspondence, Geological Survey of Scotland)

Scope and Contents Letter to Sir Charles Lyell from James Croll regarding the velocity of light and the effects that has on the temperature of the earth during the glacial period. He mentions the theories of Foucault, Le Verrier and Legrange, 1 March 1865.

Scope and Contents Letter to Sir Charles Lyell from James Croll concerning the temperature of Iceland in the glacial epoch and at the time this letter was written and how it is affected by season, position of the island and the presence of the Gulf Stream, 6 November 1865.

Scope and Contents Letter to Sir Charles Lyell from James Croll concerning the effect of the build up of ice during the glacial epoch upon the level of the ocean and his belief that the level of the ocean would not be lowered by the accumulation of ice as the level of the water would adjust itself to the altered centre of gravity of the earth, 4 January 1866.

Scope and Contents Letter to Sir Charles Lyell from James Croll concerning his calculations of the thickness of the ice sheets and the extent of the submergence which he claims are based on geological grounds. He also discusses the possible extent of the submergence, the effect on the climate of the Ice sheet and his belief that the grinding down of rock can not be attributed to floating ice but to the extent of time that the rock was covered in ice. He also states that he feels confident that the submergence and...