Leaving Union Square behind us, we pass into Broadway again at Seventeenth street. On the west side, occupying the entire block from Eighteenth to Nineteenth streets, is a magnificent building of white marble used by a number of retail merchants. The upper end, comprising nearly one half of the block, is occupied by Arnold, Constable & Co., one of the most fashionable retail dry-goods houses. At the southwest corner of Twentieth street, is the magnificent iron _retail_ dry-goods store of Lord & Taylor--perhaps the most popular house in the city with residents. The "show windows" of this house are always filled with a magnificent display of the finest goods, and attract crowds of gazers. At Twenty-third street, Broadway crosses Fifth avenue obliquely, going toward the northwest. At the northwest corner of Twenty-third street, and extending to Twenty-fourth street, is the Fifth Avenue Hotel, built of white marble, one of the finest and handsomest buildings of its kind in the world. Just opposite is Madison Square, extending from Fifth to Madison avenues. The block from Twenty-fourth to Twenty-fifth streets is occupied by the Albemarle and Hoffman Houses, in the order named, both of white marble. Just opposite, at the junction of Broadway and Fifth avenue, is a handsome granite obelisk, with appropriate ornaments in bronze, erected to the memory of General W. J. Worth. Immediately beyond this is the Worth House, fronting on Broadway and Fifth avenue. The vicinity of Madison Square is the brightest, prettiest, and liveliest portion of the great city. At the southwest corner of Twenty-sixth street is the St. James' Hotel, also of white marble, and just opposite is the "Stevens' House," an immense building constructed on the French plan of "flats," and rented in suites of apartments. Between Twenty-seventh and Twenty-eighth streets, on the west side, is the Coleman House. At the southeast corner of Twenty-ninth street is the Sturtevant House. At the northeast corner of Twenty-ninth street is the Gilsey House, a magnificent structure of iron, painted white. Diagonally opposite is Wood's Museum. At the southeast corner of Thirty-first street is the Grand Hotel, a handsome marble building. The only hotel of importance above this is the St. Cloud, at the southeast corner of Forty-second street. At Thirty-fourth street, Broadway crosses Sixth avenue, and at Forty-fourth street it crosses Seventh avenue, still going in a northwesterly direction. It is but little improved above Thirty-fourth street, though it is believed the next few years will witness important changes in this quarter. There are no street car tracks on Broadway below Fourteenth street, and in that section "stages," or omnibuses, monopolize the public travel. Several hundreds of these traverse the street from the lower ferries as far as Twenty-third street, turning off at various points into the side streets and avenues.