By April 1857, all of Darwin's hard work had made his chronic illness return in full force. He took time off in April for more hydropathy, which he was beginning to think worked only because it relaxed him and forced his mind of work. Nevertheless, he was happy to do anything that could make the pain, nausea, and weakness subside. He worked productively for another year, but on June 18, 1858, he received a letter which instantly set him back: it was a short manuscript from Alfred Russell Wallace, a younger naturalist with whom Darwin had been in contact off and on for several years, and, at first reading, it looked like a carbon copy of Darwin's own theory.Darwin felt threatened. After Darwin had worked twenty years and waited for the right moment to publish, a young naturalist had come up with the same ideas. He wrote to Lyell for advice. Should he do the honorable thing, sending Wallace's article to the
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