This book is a study of ''Romantic Pantheism'' and its part in the development of the Romantic theory of the Imagination. The crucial point in the history of English Romanticism came when the philosophical concept of the ''active universe'' met the developing theory of the Imagination. In its leading sense, Imagination meant full response to, and implication with, the living qualities of natural objects. That is why it was able to assimilate and transform contemporary theories of merely passing interest into an important poetic approach to the universe.