The work is divided into two parts. Part One marshals behavioral and morphological evidence to argue that humans evolved from other animals. Darwin shoes that human mental and emotional capacities, far from making human beings unique, are evidence of an animal origin and evolutionary development. Part Two is an extended discussion of the differences between the sexes of many species and how they arose as a result of selection. Here Darwin lays the foundation for much contemporary research by arguing that many characteristics of animals have evolved not in response to the selective pressures exerted by their physical and biological environment, but rather to confer an advantage in sexual competition. These two themes are drawn together in two final chapters on the role of sexual selection in humans.
In their Introduction, Professors Bonner and May discuss the place of The Descent in its own time and relation to current work in biology and other disciplines.
One of the most beloved books in American literature, Walden is must reading for any American or anyone interested in reading great literature. But for those who go there looking for reasons Thoreau became a recluse they are sure to be disappointed. Instead, reading Walden is more of a journey to the self and how that self can live in the world. This new edition has an insightful and lyrical essay introducing the text by Sam Pickering, the inspiration for the Dead Poets Society. His essay is the most provocative piece on Walden since e. B. White.