This is the 1859 British edition, and as such it is the second best edition. The 1860 British edition is slightly better in that it contains some insignificant, but non-substantive, corrections. However, the 1860 British edition is probably not available as an audio book. The editions of 1861, 1866, 1869, and 1872 are all inferior. In them Darwin made changes and expansions in an effort to meet the objections that arose during those times. The modifications expanded the book and clouded the argument. Since most of the objections that were raised would be regarded as silly today, Darwin's arguments against them are of interest for social history, but not for Darwin's theory.