Letter CLXV. To Leo Augustus. [This letter, which is sometimes called the Second Tome, contains the detailed statement of the catholic doctrine of the Incarnation, which Leo had promised the Emperor in Letter CLVI.  It consists of 9 chapters, but, as chaps. iii. to viii. and parts of ii. and ix. are almost identical in language with Letter CXXIV., already given in full, I have not thought it necessary to reproduce the letter here.  At the end a long series of quotations from Hilary, Ambrose and other Fathers bearing upon the doctrine are also added, but these also are dispensed with in accordance with our general practice, as we are now presenting Leo and no one else to the reader.]