A look at the origins of British abolitionism as a problem of eighteenth-century science, as well as one of economics and humanitarian sensibilities How did late eighteenth-century British abolitionists come to view the slave trade and British colonial slavery as unnatural, a “dread perversion” of nature? Focusing on slavery in the Americas, and the Caribbean in particular, alongside travelers’ accounts of West Africa, Brycchan Carey shows that before the mid-eighteenth century, natural histories were a primary source of information about slavery for British and colonial readers. These natural histories were often ambivalent toward slavery, but they increasingly adopted a proslavery stance to accommodate the needs of planters by representing slavery as a “natural” phenomenon. From the mid-eighteenth century, abolitionists adapted the natural history form to their own writings, and many naturalists became associated with the antislavery movement. Carey draws on descriptions of