| Description | Letters dated 1914-1919 regarding Isserlis' research into Professor Leontovitch, carried out on Pearson's behalf; enclosing a draft letter from Isserlis to the Ministry of Munitions, offering his services for war work; regarding an accident involving one of Pearson's dogs, Wang; and regarding the calculation of mean values and coefficients, with enclosed equations. Letter dated 1924 regarding a paper by Tchouproff which appeared in <i>Biometrika</i>, with enclosed equations; and a letter dated 1927 regarding the possibility of printing Tchouproff's final paper in translation in <i>Biometrika</i>. |