This notebook contains Charles Lyell's notes from 26 April 1846 to 4 May 1846 [the stated end date is inferred from the start date of the following notebook]. The Lyells returned to Philadelphia, following an absence of several months, at the end of April. Charles left his wife with friends at Philadelphia and traveled to Richmond, Virginia to resume his examination of the coal fields, ‘left half-finished in December last’. He made excursions to coal mines north and south of Blackheath, including those of Townes and Powell’s, Midlothian, and Deep Run, in the Chesterfield area of the East Virginian Coal-Field. This was followed by an expedition with Dr. Wyman to examine the geology of the region around Richmond and the cliffs near Acquia Creek. Charles continued his travels to join with Mary in New York City. The notes consist of commentary about politics, including slavery, as well as natural history and geological field notes and observations, much related to the coal fields, with numerous sketches. Notes are in ink and pencil. The index is located in the back of the notebook on pages 91-95, plus one unnumbered page, with four pages of blue paper (one sheet folded vertically) added and tied by white thread into place at the end of the notebook.