The eighteenth-century English dictionaries of arts and sciences claimed to contain all knowledge that a person of education should possess. Richard Yeo places these scientific dictionaries in a rich cultural framework of debate that includes the classification of knowledge, the tradition of commonplaces, the Republic of Letters, the Enlightenment public sphere, copyright issues, and the specialization of science. He examines assumptions about the organization, communication, and control of knowledge in these works. Elegantly illustrated and clearly written, Encyclopaedic Visions provides a major contribution to Enlightenment studies, the history of science, and the history of ideas in general.