Eric Froner writes, the book had a galvanizing effect upon abolitionists, who understood natural selection to be a equalizing way to understand the human races, as well as naturalists like Thoreau and Asa Gray.
A brand-new book is Darwin's Backyard: How Small Experiments Led to a Big Theory by James T. Costa (Norton, 2017). Darwin's five year voyage on the Beagle is famous, less so his careful experiments and observations made around his own house, greenhouse, and estate. No one-hit-wonder, he wrote twenty-five books, contributing important discoveries in biology and botany. Costa discusses Darwin's research into worms, plant movement, heterostyly, carnivorous plants, and orchids. Costa tells us of Darwin's wide correspondence with other scientists with whom he exchanged information. Not only that, Costa shows us how we could duplicate some of Darwin's experiments using our own household tools!