Thomson advises Ledermann on how he can shorten his manuscript, and offers to send it to the Royal Society in Edinburgh.

Thomson discusses the calculations referred to in his previous letter, suggesting that Mr Kendal of the Agricultural and Fishes may be able to help. He informs Ledermann that the calculations are two Thurstone centroid analyses, one on 441 boys, the other on 430 girls, all Scottish children born on the 1st of Feb, May, Aug, and Nov of 1926.