High Quality Content by WIKIPEDIA articles! The Tractatus Logico-Philosophicus (Latin for "Logical-Philosophical Treatise") is the only book-length philosophical work published by the 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. It is recognized as one of the most important philosophical works of the twentieth century. G. E. Moore originally suggested the work`s Latin title as homage to Tractatus Theologico-Politicus by Baruch Spinoza.