Scope and Contents Includes a reprint of Thomson's letter titled Methods of Estimating Mental Factors from Nature, vol. 141, (Feb 1938), 246; a handwritten copy of Thomson's manuscript in Ledermann's hand titled Copy of Professor Thomson's M S on regression and Bartlett's estimates; and a typed copy of a letter from Bartlett to Thomson in which argues that neither he nor Thomson are right and the other wrong, but rather that both...