 It has been submitted that the writings of the period from 1946 until his death (1951) constitute a distinctive phase of Wittgenstein’s thought. These writings include, in addition to the second part of the first edition of the Philosophical Investigations (PPF), texts edited and collected in volumes such as Remarks on Colour, Remarks on the Philosophy of Psychology, Zettel, On Certainty, and parts of Remarks on the Foundations of Mathematics.