The Structure of Evolutionary Theory, Gould's massive, digressive, and provocative magnum opus, is, as Mark Ridley wrote in The New York Times, "a magnificent summary of a quarter-century of influential thinking and a major publishing event in evolutionary biology." In it, Gould attempts to trace the history of evolutionary thought and chart a path for its future. "Nothing of Darwin's central logic has faded or fully capsized", he writes, "but his theory has been transformed, along his original lines, into something far different, far richer, and far more adequate to guide our understanding of nature."