Darwin, C. R. 1861. On the origin of species by means of natural selection, or the preservation of favoured races in the struggle for life. London: John Murray. 3d edition. Seventh thousand. F381
Darwin, C. R. 1866. On the origin of species by means of natural selection, or the preservation of favoured races in the struggle for life. London: John Murray. 4th edition. Eighth thousand. F385
, which is usually regarded as the last, appeared in February 1872. Murray's accounts show that 3,000 copies were printed, but this total presumably included both those with eleventh thousand on the title page and those with twelfth, the latter being notably less common. It is again extensively revised and contains a new . This was inserted to confute the views of the Roman Catholic biologist St George Mivart. The edition was aimed at a wider public and printed in smaller type, the volume shorter again and giving the general impression of a cheap edition, which at 7s. 6d. it was. The title changes to The origin of species, and , compiled by W. S. Dallas, appears. It is in this edition that the word '' occurs for the first time. It had been used in the first edition of in the previous year, but not before in this work. 'Evolved' had been the last word of the text in all previous editions, but 'evolution' had been omitted, perhaps to avoid confusion with the use of the word by Herbert Spencer or with its more particular embryological meaning. The word had however been used in its transformist sense by Lyell as early as 1832 (Principles of geology, ). In this edition it occurs twice on page 201 and three times on page 424. The title page reads 'Sixth edition, with additions and corrections. (Eleventh thousand).'