Ingram Bywater (1840-1914) first published his edition of Aristotle's Nicomachean Ethics in 1890. His reconstruction of the Greek text is based on a careful weighing of the Greek manuscript evidence, Latin translations, the witness of early commentators and his own thorough knowledge of Aristotle's language and style. Bywater's choice of readings introduced many important alterations to the text given in previous editions; his preference for manuscripts Kb and Lb and for the commentary of Aspasius, represented by Heylbut's edition (1889), explains many of these changes. Select readings of the most important witnesses are given in a critical apparatus. Bywater's edition has been widely used by scholars and students of the Greek text of Nicomachean Ethics and a number of important translations have been based on it. The edition's carefully compiled index of key Greek words, arranged according to usage, has proved an indispensable tool to generations of Greek students.