  In 1923 and 1924, Ramsey also visited Wittgenstein, who was teaching at Puchberg am Schneeberg (Lower Austria). During these visits, Wittgenstein made changes to the text and translation, that were incorporated in later editions. (Details are given in (Lewy 1967).) At first under the spell, Ramsey became disillusioned. In 1923, he wrote home that he would “try and pump him for ideas for [Principia Mathematica’s] further development which I shall attempt” (Wittgenstein [LO], 78), but in 1924 he remarked laconically: “He is no good for my work” (Sahlin 1997, 64).