The groundbreaking first book by a major evolutionary biologist, published in 1912, that anticipated current thinking about organismal complexity.Julian Huxley’sThe Individual in the Animal Kingdom, published in 1912, is a concise and groundbreaking work that is almost entirely unknown today. In it, Huxley analyzes the evolutionary advances in life’s organizational complexity, anticipating many of today’s ideas about changes in individuality. Huxley’s overarching system of concepts and his coherent logical principles were so far ahead of their time that they remain valid to this day. In part, this is because his explicitly Darwinian approach carefully distinguished between the integrated form and function of hierarchies within organisms and loosely defined, nonorganismal ecological communities.InThe Individual in the Animal Kingdom, we meet a youthful Huxley who uses his commanding knowledge of natural history to...