Twain first started to compose an autobiography in 1870, but proceeded fitfully, abandoning the work and returning to it as the mood took him. In a 1904 letter to William Dean Howells, he wrote: “I’ve struck it! And I will give it away—to you. You will never know how much enjoyment you have lost until you get to dictating your autobiography.” By 1904 Twain had embarked on what he called his “Final (and Right) Plan” for telling the story of his life. However, after 1907 he again seems to have let the book languish; in 1908-9 he hardly added to it at all, and he declared the project concluded in 1909, after the death of his youngest daughter Jean. His innovative notion — to “talk only about the thing which interests you for the moment” — meant that his thoughts could range freely. Twain thought his autobiography would be most entertaining if he went off on whims and tangents in non-sequential order. Twain outlined a plan in 1899 for an autobiographical work which was to be published (according to different accounts of the episode) either "100 years from now" or "100 years after his death." A manuscript note in the Mark Twain Papers (UC Berkeley) indicates a 100-year ban was what he was contemplating. Twain did produce a preface 'From the Grave' claiming that the book would not be published until after his death, which allowed him to speak with his "whole frank mind." The manuscript and typescript materials of the Autobiography are in the Mark Twain Papers at The Bancroft Library, University of California, Berkeley.