Exhibit 4 DEPARTMENT OF STATE -------- ADVISER ON POLITICAL RELATIONS December 16, 1941. Mr. Secretary: We have arranged with Mr. Spaulding for him to take charge of and set three of four men to work upon compilation of documents in United States-Japanese relations for the period September 18, 1931 to December 7, 1941. Mr. Hamilton, Mr. Ballantine, Mr. Hiss and I will keep in close touch with this work as it proceeds. Mr. Ballantine will have special charge of the data relating to the exploratory conversations of this year. S.K.H. Initialed for Hornbeck by Alger Hiss Initials of Hornbeck and Ballantine in the FEA stamp FILED MAR 25 1942 PA/H:SKH:FLB