Despite the fundamental importance of this concept in modern political thought priestley's role in its articulation has been ill-served by the absence of a modern edition of those works in which the argument was forged. This new collection will be the first to make accessible to students Priestley's Essay on the First Principles of Government and The Present State of Liberty in Great Britain and America, which reflect his most concentrated engagement with these issues at a crucial moment in his own life and that of the state. An introduction and notes, together with guides to further reading and key figures in the text, provide the student with all the material necessary for approaching Priestley.