Scope and Contents Letters are summarised as: 1) Explaining the theories of 'uniformity of the sea depth' in reference to equations from Mary Somerville and Pierre Simon de Laplace. Mentions seperate theory of absolute depth in relation to the moon and tides. Adds personal views on Somerville and De Laplace's theories. 2) Mentions Charles Henry Davis (US Navy - researcher of tides and currents) paper on the winds impact on tide direction and the the winds influence on the movement of shingle...

Scope and Contents This black leather notebook was written whilst Lyell was in London, at 11 Harley Street and starts with memoranda, then a list of 'scientific visitors'. Written in London in the years between his travels in America, this notebook considers giraffe and bony fossil fish, but in particular focuses on the work of William, Ellery Channing (April 7, 1780 – October 2, 1842), Unitarian preacher, and on race, slavery and religion. Lyell's own index...