The best materials for this part of ecclesiastical history may be found in the edition of Optatus Milevitanus, published (Paris, 1700) by M. Dupin, who has enriched it with critical notes, geographical discussions, original records, and an accurate abridgment of the whole controversy. M. de Tillemont has bestowed on the Donatists the greatest part of a volume (tom. vi. part i.): and I am indebted to him for an ample collection of all the passages of his favourite St. Augustin which relate to those heretics.