Marked 'To Canada with the Prime Minister and Chiefs of Staff' inside front cover. A small pocket diary, about 30 pages of writing, written to his wife Ethel Whitby in his absence. Describes lunch with the Prime Minister on the train on the way to board the Queen Mary, 5 September, where Whitby joined Sir Alan Brooke, Admiral Cunningham and Sir Charles Portal. He refers to the 'noble Lord' (Churchill's physician, Lord Moran) and describes a sumptuous dinner on board on 6 Sept. Entries include: (8 Sept) being summoned to check 'morning gob that the PM had expectorated' to check for blood (there wasn't any) in the lab at the bottom of the ship; (9 Sept) carrying out 'blood counts etc' as the PM had a temperature. 'I fear he is not in a very good condition and there may be much anxiety before this trip is over'; (10 Sept) lunch on board before landing at Halifax, with 'Mr C, Lord Cherwell, Alan Brooke, Andrew Cunningham, Charles Portal and little me'. (11 Sept) arrival at Chateau Frontenac; (15 Sept) description of dinner with Churchill at the Citadel, including a seating plan where Dr Whitby sat next to US President Roosevelt and near Winston Churchill, who ;were most delightful' [this meal is described in more detail in one of his letters to Ethel copied by the family]; (19 Sept) train jounrey from Quebec to New York to re-board the Queen Mary home; (21 Sept) dinner with Churchill and Admiral Cunningham, during which they 'refought the Battle of Matapan and several other battles of this and the last'.