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Thomson continues to discuss Burt's paper, The Correlation between Persons, from the British Journal of Psychology, Jul 1937, providing an alternative to Burt's formula, which he criticises as being unnecessarily complex.

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Thomson asks Ledermann to discuss an example given by Burt in his article on correlations between persons which Thomson is having difficulty with, at their next meeting. He expounds upon the point in great detail, with most of the letter taken up with his working.

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Thomson discusses his difficulties in retrieving offprints from Customs House at Leith.

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Thomson continues to discuss Burt's article, The Correlation between Persons. He reproduces equations Ledermann sent in response to his previous letter, and asks him to clarify them.

Scope and Contents Thomson suggests Ledermann's new address means he has now found a house, and wishes he and his parents happiness. He asks him to send on the Psychometrika offprints. He refers Ledermann to two papers by E B Wilson and Jane Worcester respectively in the Proceedings of the National Academy of Sciences, in particular drawing his attention to their use of a Thurstone formula, and suggests Ledermann might want to pursue the matter...

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Thomson gives Ledermann his address at the Training College, Bingley, for the following fortnight, informing him he will be lecturing there and asking him to write. He also mentions an enclosed cheque, which has not survived in the collection, asking Ledermann to sign and return it.

Scope and Contents 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...

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Short letter in which Thomson reminds Ledermann to order 150 offprints of Ledermann's article, which the research fund will pay for.

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Small postcard regarding Ledermann's comments on Thomson's use of the auxiliary matrix.

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Postcard acknowledging Ledermann's letter regarding Bartlett's estimates, which Thomson doubts have the minimum standard error. He discusses the error variances of the regression estimates, referring to a numerical example he has sent.