Charles Darwin published On the Origin of Species in November 1859, having spent twenty years accumulating evidence and working out the implications of the idea he had formed in 1838. The first edition sold out on its publication day. Darwin's central argument is that species are not fixed and separately created but have descended from common ancestors through a process of natural selection: individuals within a species vary, some variations are heritable, and those individuals whose heritable variations are better suited to their environment survive and reproduce at higher rates, gradually shifting the characteristics of the population. Given sufficient time and reproductive isolation, populations diverge far enough to constitute new species.
Darwin withheld discussion of human origins from the Origin, mentioning only at the book's end that "light will be thrown on the origin of man and his history", a deliberate understatement. He knew the religious and cultural implications of extending his argument to humans and chose to establish the general theory before engaging those implications directly, which he addressed in The Descent of Man in 1871. The book was controversial immediately, most famously at the 1860 Oxford debate where Thomas Huxley defended Darwin against Bishop Wilberforce, but the scientific community accepted natural selection as the mechanism of evolution relatively quickly.
Reading Darwin in the original is a different experience from reading summaries of evolutionary theory, because Darwin writes as a nineteenth-century naturalist accumulating evidence rather than as a modern scientist presenting established consensus. The chapter on difficulties of the theory is particularly instructive: Darwin identifies and addresses the strongest objections to his argument with a candor that scientific writing has increasingly abandoned in favor of confident assertion. The book demonstrates something about how transformative ideas are actually argued, carefully, incrementally, through the accumulation of specific cases rather than through declaration of general principle.
The novel's enduring readability owes much to the precision of its construction, the economy of means by which it achieves its effects, and the care with which the author builds a world that is internally coherent enough to generate genuine surprise at the moments of revelation. These are qualities that no amount of time diminishes, and they are why the book continues to find new readers across generations.
Freud's Interpretation of Dreams sold only 351 copies in its first six years after publication.
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