Book excerpt: Cultural Writing. Political Science. Cutting through the myths, misunderstandings, and neglect that have obscured the influence of Darwinism on radical thought, this detailed account examines the paradoxical challenges that Darwinism posed for late 19th- and early 20th- century socialism. This study shows that Darwin provided British socialists from Alfred Russel Wallace to Emile Vandervelde with a new language of political expression, and that socialist thought developed through interaction with the most advanced biological theories of the day.