This work is a new edition of Thomas Jefferson's literary commonplace book, a notebook of his literary and philosophical reading. Unlike the only previous edition, published in 1928, it contains full annotation, pertinent information on the authors and works commonplaced, and a rationale for dating the entries. Thus it is now possible to show that most of the four hundred seven passages were entered when Jefferson was a young man, between the ages of fifteen and thirty. As such, they reflect the range of his literary interests from his school days to about the time of his marriage and involvement in politics.