Charles Knapp, a professor of Classics at Columbia University in the early 20th century, gives an account of the publication history and reception of Vahlen's edition of the Roman historical author Ennius. This edition still remains the standard collection of the fragments of Ennius, and for this reason this essay remains a useful assessment for those wishing to explore what little of Ennius there is to be read. It also provides a case story for the process by which such editions were compiled in a time before computerization and easy trans-Atlantic communication made such projects somewhat less daunting. This is a valuable relic of the history of scholarship itself as much as it is a book review.