Handwritten article on the geology of Grande [sic Gran] Canaria and the way in which the rocks were formed. Seeming to be a summary of Lyell's observations while on the island, 1855 - it is not in his handwriting, and is perhaps written by Mary Lyell, or Georg Hartung.

On the Geological Structure of the Madeiran Islands by Sir Charles Lyell and Georg Hartung which is a summary of their observations during a visit to the Madeiran Islands in the winter of 1853-1854 and to three Canary islands, La Palma, Teneriffe and Grand Canary, in the Spring of 1854, with diagrams, 1856.