 After meeting and falling out with Ramsey when visiting Keynes in 1925, Wittgenstein returned to settle in Cambridge in 1929. He was admitted as a Ph.D. student, submitting the Tractatus as his thesis, Ramsey was his supervisor; they met regularly during what was to be the last year of Ramsey’s life. Wittgenstein was later to recall the significance of these conversations for his own intellectual development in the preface to Philosophical Investigations. Ramsey fell ill at the end of November 1929 and was diagnosed with jaundice. He had been corresponding with Schlick and had promised to write a review of Rudolf Carnap’s Aufbau. He died on 19 January 1930 in Guy’s Hospital in London. His death was unexpected and its causes remain uncertain. In an obituary for the Cambridge Review, Braithwaite wrote, ‘His intellectual subtlety was combined with the most delightful simplicity and candour. Intolerant of fools, he inspired others by his mental fertility and integrity. To one at least of his friends his death is as if a lighthouse were extinguished and we were left to grope our way in the dark’ (1930, 216). 