June 6, 1926 letter from Lady Grace Osler to Wilburt Davison mentioning that Dr. Howland would be visiting her and several mutual acquaintances would be visiting him.
November 5, 1950 letter from Susan R. Chapin to Wilburt Davison thanking him for a copy of his "Thumbnail Sketch" and "Reminisces" of Sir William and Lady Grace Osler.