B.F. Westcott's classic work on the Greek text of the Gospel of John was the fruit of forty years of research, the book having been commissioned around 1860 and published posthumously by his son. The Greek text is that of Westcott and Hort. Readings of select Greek uncial manuscripts are placed beneath the text in the case of textual variants noted in the Introduction, and all the more important readings are treated in special critical notes, which are indexed.