Since then, many of the manuscripts and typescripts that constitute Wittgenstein’s Nachlass have been published as ‘works’ by Wittgenstein – Philosophical Remarks, Philosophical Grammar, The Blue and Brown Books, Remarks on the Philosophy of Mathematics, Remarks on the Philosophy of Psychology, On Certainty, On Colour, etc. Though all of these contain important philosophical writings, it should be borne in mind that none of them, not even Philosophical Investigations, can be regarded as a book by Wittgenstein.
