This extract and the next three were discovered in the year 1715 by [Christopher Matthew] Pfaff, a learned Lutheran, in the Royal Library at Turin. The mss. from which they were taken were neither catalogued nor classified, and have now disappeared from the collection. It is impossible to say with any degree of probability from what treatises of our author these four fragments have been culled. For a full account of their history, see Stieren’s edition of Irenæus, vol. ii. p. 381. [But, in all candor, let Pfaff himself be heard. His little work is full of learning, and I have long possessed it as a treasure to which I often recur. Pfaff’s Irenæi Fragmenta was published at The Hague, 1715.]