The Descent of Man is Darwin's second book, first published in 1871. In this edition, Darwin applies evolutionary theory to humans and details his theory of sexual selection.

This volume is part of the definitive edition of letters written by and to Charles Darwin, the most celebrated naturalist of the nineteenth century. Notes and appendixes put these fascinating and wide-ranging letters in context, making the letters accessible to both scholars and general readers. Darwin depended on correspondence to collect data from all over the world and to discuss his emerging ideas with scientific colleagues, many of whom he never met in person. The letters are published chronologically: volume 20 includes letters from 1872, the year in which The Expression of the Emotions in Man and Animals was published, making ground-breaking use of photography. Also in this year, the sixth and final edition of On the Origin of Species was published and Darwin resumed his work on carnivorous plants and plant movement, finding unexpected similarities between the plant and animal kingdoms.

Charles Darwin transformed our understanding of the world with the idea of natural selection, challenging the notion that species are fixed and unchanging. These writings from On the Origin of Species explain how different life forms appear all over the globe, evolve over millions of years, become extinct and are supplanted. Great Ideas — Throughout history, some books have changed the world. They have transformed the way we see ourselves — and each other. They have inspired debate, dissent, war and revolution. They have enlightened, outraged, provoked and comforted. They have enriched lives — and destroyed them. Now Penguin brings you the works of the great thinkers, pioneers, radicals and visionaries whose ideas shook civilization and helped make us who we are.

Throughout history, some books have changed the world. They have transformed the way we see ourselves — and each other. They have inspired debate, dissent, war and revolution. They have enlightened, outraged, provoked and comforted. They have enriched lives — and destroyed them. Now Penguin brings you the works of the great thinkers, pioneers, radicals and visionaries whose ideas shook civilization, and helped make us who we are.

In The Origin of Species Darwin outlined his theory of evolution, which proposed that species had been evolving and differentiating over time under the influence of natural selection. On its publication it became hugely influential, bringing about a seismic shift in the scientific view of humanitys place in the world that is still controversial today. It is both a brilliant work of science and also a clear, vivid and at times even moving piece of writing that reflects both Darwins genius and his boundless enthusiasm for the natural world.

Charles Darwin's travels around the world as an independent naturalist on HMS Beagle between 1831 and 1836 impressed upon him a sense of the natural world's beauty and sublimity which language could barely capture. Words, he said, were inadequate to convey to those who have not visited the inter-tropical regions, the sensation of delight which the mind experiences'. Yet in a travel journal which takes the reader from the coasts and interiors of South America to South Sea Islands, Darwin's descriptive powers are constantly challenged, but never once overcome. In addition, The Voyage of the Beagle displays Darwin's powerful, speculative mind at work, posing searching questions about the complex relation between the Earth's structure, animal forms, anthropology and the origins of life itself.