In the first letter, dated 28 Oct 1939 and numbered 12 (39), Thomson refers to Ledermann's manuscript, which he had originally enclosed with some deletions suggested by a referee. These have not survived in the collection. He tells Ledermann that he is unsure if Professor Kendall will apply for a Carnegie Grant, or if Thomson or Ledermann will have to.

In the second letter, dated 15 Nov 1939 and numbered 12 a (39), Thomson invites Ledermann to tea and refers him again to the articles by E B Wilson and Jane Worcester, in particular two matrices of loadings which they use and which Thomson transcribes. He informs Ledermann that his son, Hector Thomson, will be continuing with his work in Nicosia.