Principles of Geology; or, The Modern Changes of the Earth and its Inhabitants Considered as Illustrative of Geology.

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In lightly faded brown embossed cloth, edges rubbed. Spine, gilt titles, edges worn. Internally, half title, tissue guarded frontis, [7], (x-xii), [1], 2-824 pp, [2] adverts, complete with 5 plates (including 1 folding map), a.e.g. (faded), profusely illustrated with illustrations within text, yellow endpapers, some spotting to blanks, light edge browning. A new and entirely revised edition. (231*148 mm). Crucially, his vision of change as a steady process led his to calculate that the Earth was far older than was previously believed, and that the process had a direct effect upon species variation. These two revolutionary ideas had a profound effect upon Darwin. As he wrote in his autobiography, 'my books came half out of Lyell's brain'.