Wrinch volunteers to make an index of symbols for Principia. She describes the needed index as one that "would give the page or ref. to the first occurrence of the symbols." (In fact, volume I of the second edition ends with an 8-page "List of Definitions".)

Wrinch has seen BR "the other day" and is going with her husband to Telegraph House for a day or two and asks if BR will be there. (A search of his diaries does not find her name or T.H. mentioned in 1924.)