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 modifications he has made to his Submergence Theory which held that the level of the ocean would not be lowered by the accumulation of ice due to Lyell passing on some calculations as to the amount of water needed from the oceans to form an ice-sheet of sufficient mass to alter the earth's centre of gravity. He encloses a letter to the Reader to put the matter straight and asks for Lyell's approval. 6 January 1866.

Scope and Contents Letter to Sir Charles Lyell from James Croll regarding another alteration to his Submergence Theory which he explains in sheets which he encloses for Lyell to send to The Reader with his earlier letter (See Lyell 1/593-594). His alterations concern the structure of ice caps which have a solid crust covering and a liquid nucleus, 8 January 1866.

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.

Scope and Contents Letter to Sir Charles Lyell from James Croll apologising to Lyell for inadvertantly misrepresenting Lyell's view of the Submergence Theory causing him to write a letter of explanation to the Reader. Croll outlines how such a thing could have happened and points out why he thinks Lyell is mistaken in his objections to the theory, 16 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...