 In addition to the powers normally exercised only on the advice of the Prime Minister, there are certain uncodified reserve powers, exercisable on the Governor-General's own initiative.Kerr chose to make a study of the reserve powers through his earlier professional relationship with Evatt, the author of the standard work on the reserve powers as they applied to the British Dominions, "The King and His Dominion Governors" (1936).Kerr was familiar with this book, and re-read it before accepting Whitlam's offer of the governor-generalship.