2015 Reprint of 1922 Edition. Full facsimile of the original edition. Not reproduced with Optical Recognition Software. The "Tractatus Logico-Philosophicus" (Latin for "Logical-Philosophical Treatise") is the only book-length philosophical work published by the German-Austrian philosopher Ludwig Wittgenstein in his lifetime. It was an ambitious project - to identify the relationship between language and reality and to define the limits of science - and is recognized as a significant philosophical work of the twentieth century. Considered by some to be the greatest philosopher of the 20th century, Ludwig Wittgenstein played a central, if controversial, role in 20th-century analytic philosophy. He continues to influence current philosophical thought in topics as diverse as logic and language, perception and intention, ethics and religion, aesthetics and culture. Contains an introduction by Bertrand Russell.