Contestants on “Jeopardy!” this week were asked to identify the book that opens with this line: “Robert Cohn was once middleweight boxing champion of Princeton.” The answer (or rather the question) was: What is “The Sun Also Rises”?

Yet, as a new edition of this 1926 classic by Ernest Hemingway shows, up until the final galleys, Cohn’s college feats were not even included in the opening chapter. Originally, Hemingway began his tale of the Lost Generation by introducing its beautiful and heartsick embodiment, Brett Ashley: “This is a novel about a lady.”

This discarded first chapter, along with other deletions, earlier drafts and alternate titles, is included in a new edition of the novel that Scribner is releasing later this month. The glimpse into Hemingway’s creative process is not new. As the author’s grandson Sean Hemingway explained in an interview, “While the material has been discussed at great length by scholars, it hasn’t been brought together in this way before, and it hasn’t been accessible to the general public.” Mr. Hemingway, a curator of Greek and Roman art at the Metropolitan Museum of Art, also wrote a new introduction for this edition.

“Sun,” Hemingway’s debut novel, has its roots in his experiences in the summer of 1925, at the annual running of the bulls festival in Pamplona, Spain, with his first wife, Hadley Richardson Hemingway, and a group of friends. This year’s dashes start on Monday. With its organized coach tours and official list of prohibitions (including running while drunk or wearing inappropriate footwear), the current incarnation would have been inconceivable to Hemingway, even though he, perhaps more than anyone, is responsible for its international fame.