Wells’s edition marks the first time that Hall’s extensive borrowings from Latin medical textbooks for the production of his own casebook have been thoroughly and compellingly identified. This section describes the methodology adopted to recreate Hall’s library, and the books and authors themselves are clearly listed. This identification of Hall’s working library sheds completely new light on Hall and is significant in several contexts. It allows us to understand when, why and how Hall acquired his books. His use of them in relation to his patients and how he wrote up his medical cases shows us how Hall used his library: to identify therapies for his patients during his working life, and then to turn his initial case notes into a draft for his own Latin textbook. This section situates Hall’s working library in the context of other early modern medical libraries and describes Hall’s use of books over time. Tables provide a list of books in Hall’s library and show his most frequently used sources. Wells is the first to present Hall’s casebook in terms of the library on which it relies, so this whole section represents a highly original contribution to the field.