In this ground-breaking study, Mary Floyd-Wilson argues that the early modern English believed their affections and behavior were influenced by hidden sympathies and antipathies that coursed through the natural world. These forces not only produced emotional relationships but they were also levers by which ordinary people supposed they could manipulate nature and produce new knowledge. Indeed, it was the invisibility of nature's secrets--or occult qualities--that led to a privileging of experimentation, helping to displace a reliance on ancient theories. Floyd-Wilson demonstrates how...