This thesis examines the imaginative richness of literary synaesthesia, the use of the terminology of one sense impression to describe the sensation of another, in British Romantic poetry. My study of the creative fertility of synaesthesia, located at the interface of Romantic poetry and science, is contextualised with reference to literary, philosophical and scientifïc discourses and contemporary debates about cross-sensory perception, and it is elucidated through close readings of poems by William Wordsworth, Samuel Taylor Coleridge, John Keats and Percy Bysshe Shelley, respectively. Acknowledging the widespread Romantic interest in multisensory combination while remaining attentive to the historical situatedness of notions of 'sensation'...