"On April 24, Bertrand Russell himself wrote a brief note to Inge agreeing to start private instruction the next day at 11:00 and asking her to let him know after his lecture if she was coming.14  Evidently, she  had  decided to  do  what one  typically  did when aiming for the mathematical Tripos— hire a private tutor. She presumably chose Russell because she already knew him both privately and as a lecturer. However, their collaboration did not last long. In mid-May, Russell wrote to her again, this time to express  his  understanding that  she  did not  have  the time  required for intense work with a private tutor. “I can quite see that under the circumstances, you wouldn’t have time to do any work for me. If next year or the year after you have more time I shall (so far as I can see) be quite able and willing to resume the lessons then”, he wrote.15" (Hanne Strager, If I Am Right, and I Know I Am [New York: Columbia U. P., 2025], p. 82. 

The later letter is at record 135573.