Un-numbered letter from Thomson to Ledermann regarding the formula number of common elements divided by the geometrical mean of the two totals, 11 Jan 1943

Thomson also wishes Ledermann and his family a Happy New Year, and asks Ledermann about the university examinations process in Germany, telling him of his own experience.

Thomson discusses dice throwing, referring to his own article, a Hierarchy without a General Factor, from the British Journal of Psychology, and his own experiments with dice.

The letter is written on the back of several tables and graphs regarding intelligence. It is unclear which report or article these are from, but they feature titles including Reading and Spelling: differences in mean AQ for LE and RE boys and girls; Reading Accomplishment in association with Incidence of Left-and Right-eye dominancy; Distribution of IQs in association with incidence of Left- and Right eye Dominancy; and Percentages of Total Retarded Group in Categories of Accomplishment and Intelligence.

Also includes a note from Derrick Lawley indicating he is returning the letter to Ledermann after Ledermann forgot it.