This Edition is a reprint of the Sixth, the only changes (besides correction of a few clerical errors) being an alteration of type in the passage which occurs on p. 457 in the Sixth Edition and pp. 457-459 in this Edition, together with consequent changes (1) in paging and indexing, (2) in the reference to the passage in question in the reprinted Preface to the Sixth Edition, and (3) in the insertion of the note on p. 457.

E. E. C. J.

December 1906.