First published in 1903, this book is an edition by James Herbert Srawley of the Oratio Catechetica by Gregory of Nyssa. Collating the texts of numerous manuscripts - many of which had not been used to produce an edition before - Srawley's edition was designed to assist students in placing Gregory's treatise in its proper historical setting. The text is given in Greek, with extensive notes in English clarifying particular words and phrases and contextualizing the work. In addition to the notes, Srawley also offers an English introduction to the work, discussing its character, date, authenticity, and literary history, and placing it in the context of Gregory's wider teaching.