Thomson tells Ledermann how glad he would be if, on leaving the University of St Andrews, he would take Lawley's vacated post. He makes him aware of the disadvantages of the post, in particular that it relies on a fund and as such is not permanent, and that would be an unconventional route from which to apply for possible future mathematics lectureships. He also states Emmett's pleasure at the possibility of working with Ledermann.

Thomson also thanks Ledermann for notes regarding proofs, and asks him if the date of his wedding is confirmed.

Thomson also invites Ledermann and his family to stay with Lady Thomson and himself in Edinburgh, referring to his improved health. He also tells Ledermann that he wants his view on an article in Psychometrika by A Finn.

Thomson informs Ledermann he will be speaking about their work on Factorial Analysis at a meeting of the Royal Society [of Edinburgh]. He asks Ledermann if he will also take part, along with Lawley.

Thomson stresses that, although the lectures are to be delivered to scientists, the scientific audience come from varied backgrounds, and as such the lectures should be easily understood.

The collection largely consists of letters from Godfrey Thomson to Ledermann. Many are highly mathematical in content, containing formulae and mathematical notation, though they also regard social events and contain enquiries from Thomson with regards to the safety of Ledermann's family throughout the war.

Thomson tells Ledermann that he will be opening a discussion regarding Cyril Burt's The Factors of the Mind for the next meeting of the Factorial Club, and he ends by saying that he hopes 1941 will be a better year than 1940.

The letter is written on the reverse of a preliminary notice for the Twelfth International Congress of Psychology.

Thomson remarks on a paper of Ledermann, highlighting corrections, and advises him with regards to slides for his Royal Society [of Edinburgh] lecture mentioned in his previous letter.

Also includes two sets of typescript notes titled Positive Structure in Factorial Analysis and Geometrical Illustrations of Factors and Correlations, most likely relating to the aforementioned lecture.

Thomson asks Ledermann what he thinks of the review, and asks him to pass it onto Derrick Lawley. He refers to Ledermann's sisters who are in Palestine, and hopes all is well.

Thomson tells Ledermann how glad he is that he will be attending the meeting, since he wants to discuss some difficulties he is having with Burt's work, particularly his reciprocity of tests and persons. He outlines these difficulties with several pages of explanatory working.

Written on the back of several copies of the preliminary notice for the twelfth International Congress of Psychology.