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 sending an abstract of a paper containing conclusions further to a paper which was published in August 1863. This paper points out the correspondence between the character of geological climate and those which must result from a change in the earth's orbit, 6 April 1864.

Scope and Contents Letter to Sir Charles Lyell from James Croll concerning the eccentricity of the Earth's orbit which he has calculated for a million years past and to come of epochs 5000 years apart. He states that his results are favourable to the Cosmical Theory and will be published in the January edition of the Philosophical Magazine or in the December supplement, 25 December 1865.

Scope and Contents Letter to Sir Charles Lyell from James Croll concerning the rigidity of the Earth's crust and the submergence theory. He encloses a copy of his article entitled On The Excentricity of the Earth's Orbit, 12 January 1866.