 To each of the lines of objection to his theory, Darwin offered his contemporaries plausible, if not for many critics compelling, replies (Hull 1973). Additional arguments were worked out through the insertion of numerous textual insertions over the five revisions of the Origin between 1860 and 1872, including the addition of a new chapter to the sixth edition dealing with “miscellaneous” objections. For reasons related both to the condensed and summary form of public presentation, and also as a reflection of the bold conceptual sweep of the theory, the primary argument of the Origin could not gain its force from the data presented by the book itself. Instead, it presented an argument from unifying simplicity, gaining its force from the ability of Darwin’s theory to draw together a wide variety of issues in taxonomy, comparative anatomy, paleontology, biogeography, and embryology under the simple principles worked out in the first four chapters (chps. 11–13). In important respects, this “consilience” argument might be seen as best reflecting the impact of William Whewell’s methodology (see above), although Whewell is not cited in any of the editions.