This groundbreaking volume casts light on the long shadow of naturalistic monism in modern thought and culture. When monism's philosophical proposition - the unity of all matter and thought in a single, universal substance - fused with scientific empiricism and Darwinism in the mid-nineteenth century, it led to the formation of a powerful worldview articulated in the work of figures such as Ernst Haeckel. The compelling essays collected here, written by leading international scholars, investigate the articulation of monism in science, philosophy, and religion and its impact on a range of social movements, from socialism and early feminism to imperialism and eugenics. The result is a broad and comprehensive chronological, disciplinary, and geographic map of a century of monism, as well as a bellwether for innovative new directions in the interdisciplinary study of science, religion, philosophy, and culture.

The first survey in the English language of the history of naturalistic monism in the works of Haeckel, Spinoza, and others. Contributors demonstrate that, to a greater extent than previously shown, monism provided an essential epistemological framework for numerous religious, political and cultural movements between the 1840s and 1940s.