"Thursday night." "Then I came home and prepared my last lecture and gave it—it lead [led?] to a very lively discussion, continued afterwards by Wittgenstein in my rooms. He is certainly very good. I forget if I told you that he says his father has been disappointed in all his other sons, and is very anxious this one should do something respectable like engineering and not waste his time over such nonsense as philosophy. So he is going to finish his engineering course. But I don't believe he will give up his philosophy—it has too great a hold on him. A little engineering would do no harm."