The biologist Edward O. Wilson is a rare scientist: having over a long career made signal contributions to population genetics, evolutionary biology, entomology, and ethology, he has also steeped himself in philosophy, the humanities, and the social sciences. The result of his lifelong, wide-ranging investigations is Consilience (the word means "a jumping together," in this case of the many branches of human knowledge), a wonderfully broad study that encourages scholars to bridge the many gaps that yawn between and within the cultures of science and the arts. No such gaps should exist, Wilson maintains, for the sciences, humanities, and arts have a common goal: to give understanding a purpose, to lend to us all "a conviction, far deeper than a mere working proposition, that the world is orderly and can be explained by a small number of natural laws." In making his synthetic argument, Wilson examines the ways (rightly and wrongly) in which science is done, puzzles over the postmodernist debates now sweeping academia, and proposes thought-provoking ideas about religion and human nature. He turns to the great evolutionary biologists and the scholars of the Enlightenment for case studies of science properly conducted, considers the life cycles of ants and mountain lions, and presses, again and again, for rigor and vigor to be brought to bear on our search for meaning. The time is right, he suggests, for us to understand more fully that quest for knowledge, for "Homo sapiens, the first truly free species, is about to decommission natural selection, the force that made us.... Soon we must look deep within ourselves and decide what we wish to become." Wilson's wisdom, eloquently expressed in the pages of this grand and lively summing-up, will be of much help in that search.