Book censorship in the United States On appeal, her conviction was reversed on the grounds that contraceptive devices could legally be promoted for the cure and prevention of disease. The publication of Charles Darwin's "On the Origin of Species" in 1859 "unleashed a controversy that resonates even today. In presenting a revolutionary theory of evolution, the British naturalist challenged the biblical creation story and provoked the ire of detractors who accused him of 'dethroning God'. Despite the surrounding controversy, "On the Origin of Species" remained uncensored in the United States all the way into the 1920s, when high school curricula started to incorporate the theory of
On the Origin of Species an incipient species" and that "species are only strongly marked and permanent varieties". He argues for the ubiquity of variation in nature. Historians have noted that naturalists had long been aware that the individuals of a species differed from one another, but had generally considered such variations to be limited and unimportant deviations from the archetype of each species, that archetype being a fixed ideal in the mind of God. Darwin and Wallace made variation among individuals of the same species central to understanding the natural world. In Chapter III, Darwin asks how varieties "which I have called incipient species"