New York: Published by Hurd & Houghton, 1868; [1867]. Octavo (19.5 x 13.5 cm.), viii, 344 pages. Alphabetical table of contents (index) at front. Stated Fourth Edition. The title and copyright page remain unchanged from the first edition, but a two page Appendix has been added at rear, containing revisions and expansions of four sections in the first edition. A new "Preface to the Second Edition", dated January 1868, follows.....