The twentieth century: Moore to Popper: introduction / John Shand -- G.E. Moore: principia ethica / Philip Stratton-Lake -- Edmund Husserl: the idea of phenomenology / A.D. Smith -- William James: pragmatism: a new name for some old ways of thinking / Christopher Hookway -- Ludwig Wittgenstein: tractatus logico-philosophicus / Hans-Johann Glock -- Martin Heidegger: being and time / Charles Guignon -- Rudolf Carnap: the logical structure of the world / Thomas Uebel -- Bertrand Russell: an inquiry into meaning and truth / Pascal Engel -- Jean-Paul Sartre: being and nothingness / William R. Schroeder -- Maurice Merleau-Ponty: phenomoenology of perception / Eric Matthews -- A.J. Ayer: language, truth and logic / Barry Gower -- Gilbert Ryle: the concept of mind / Rom Harré -- Ludwig Wittgenstein: phillosophical investigations / Robert L. Arrington -- Karl Popper: the logic of scientific discovery / Jeremy Shearmur.