Thomas Hobbes 
Elements of Law [PDF ebook] 
Natural and Politic

Originally published in 1889, Ferdinand Tonnies published versions of two works by Thomas Hobbes. His editions of The Elements of Law: Natural and Politic and of Behemoth: or The Long Parliament were the first modern critical editions, based on manuscripts of works by Hobbes. Completed in 1640, The Elements of Law was Hobbes’s first systematic political work. The book helps us see Hobbes’s mind at work, for it is the first version of his later political works.