The paper investigates the history of the introduction of what was later called “analytic philosophy” in October 1911–May 1912. Despite the fact that Russell and Wittgenstein were in full agreement in their antipathy towards the old-style philosophy, for example, that of Bergson, each had his own conception of the New Philosophy. For Russell, it meant “examined philosophy”, or philosophy advanced through “scientific restraint and balance” of our theoretical conjectures, and resulted in a series of logically correctly constructed theories. For Wittgenstein, (...) it resulted in syncopated, short logical-philosophical “discoveries”. In the years to come, the two conceptions of “rigorous philosophy” embraced by Russell and Wittgenstein often came in conflict. (shrink)