THE manuscript from which this work of Eusebius has been at length recovered, after the lapse of several centuries, is that wonderful volume of the Nitrian Collection now in the British Museum, whose most curious and remarkable history I have already made known in the Preface to my edition of the Festal Letters of St. Athanasius. It is not necessary, therefore, for me in this place to give any further account of it than to state that it was transcribed fourteen hundred and fifty years ago,--as early as the year of our Lord four hundred and eleven.