This is a scholarly study by Lemuel J. Hopkins‑James, first published by Oxford University Press in 1934. It is an important work in the study of early medieval Gospel manuscripts from Celtic and Insular Christian traditions (Ireland, Wales, and Britain).
The book looks at early Irish and British Gospel manuscripts, explaining their history, artistic context, and the distinctive versions of the Latin Gospel text preserved in Celtic monastic traditions.
One important manuscript discussed is the Book of Chad (or Gospel of Teilo), which contains an early Welsh version of the Latin Gospel text. This manuscript is considered one of the earliest surviving examples of the Celtic Gospel textual tradition.