Thomson tells Ledermann how pleased he is that he is that Ledermann is going to follow up his [Thomson's] paper for the British Journal of Psychology, and asks him to include material regarding multivariate selection.

He talks about the various reading he has undertaken, referring to work by Bocher, Hotelling, and Turnbull; and discusses the connection between the correlation of orthogonal vectors produced by selection in the population, and the correlation of orthogonal vectors produced by estimating them from insufficient equations.