Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. I am happy to state, however, that Dr Moulton has not only favoured me with most valuable counsels and sugges tions in the preparation of the Commentary, but has, under conditions of peculiar difficulty, found time to revise the proof-sheets; and the following pages, however defective in other respects, will bear some traces of his extreme accuracy, his admirable judgement and finished scholarship.