There now remains for you to cross the _Street of Abundance_ at the southern extremity of the city. It is the quarter of the triangular Forum, and of the Theatres--the most interesting of all. The principal monuments to be seen are-- _The Temple of Isis_. See Chap. VII. The Curia Isiaca. _The Temple of Hercules_. Chap. VII. _The Grand Theatre_. Chap. VIII. _The Smaller Theatre_. " _The Barracks of the Gladiators_. Chap. VIII. At the farther end of these barracks opens a small gate by which you may leave the city, after having made the tour of it in three hours, on this first excursion. On your second visit you will be able to go about without a guide. =Charles Scribner & Co.= 654 Broadway, New York, HAVE JUST COMMENCED THE PUBLICATION OF =The Illustrated Library of Wonders.= This Library is based upon a similar series of works now in course of issue in France, the popularity of which may be inferred from the fact that OVER ONE MILLION COPIES have been sold. The volumes to be comprised in the series are all written in a popular style, and, where scientific subjects are treated of, with careful accuracy, and with the purpose of embodying the latest discoveries and inventions, and the results of the most recent developments in every department of investigation. Familiar explanations are given of the most striking phenomena in nature, and of the various operations and processes in science and the arts. Occasionally notable passages in history and remarkable adventures are described. The different volumes are profusely illustrated with engravings, designed by the most skilful artists, and executed in the most careful manner, and every possible care will be taken to render them complete and reliable expositions of the subjects upon which they respectively treat. For THE FAMILY LIBRARY, for use as PRIZES in SCHOOLS, as an inexhaustible fund of ANECDOTE and ILLUSTRATION for TEACHERS, and as works of instruction and amusement for readers of all ages, the volumes comprising THE ILLUSTRATED LIBRARY OF WONDERS will be found unexcelled. The following volumes of the series have been published:-- =Optical Wonders.= THE WONDERS OF OPTICS.--By F. MARION. Illustrated with over seventy engravings on wood, many of them full-page, and a colored frontispiece. One volume, 12mo. Price $1 50 _For specimen illustration see page 31._