It has happened to me, on various occasions, to find myself in a certain edifice which would appear to have some of the characteristics of a public exchange. Its interior is a spacious hall, with a pavement of white marble. Overhead is a lofty dome, supported by long rows of pillars of fantastic architecture, the idea of which was probably taken from the Moorish ruins of the Alhambra, or perhaps from some enchanted edifice in the Arabian tales. The windows of this hall have a breadth and grandeur of design and an elaborateness of workmanship that have nowhere been equalled, except in the Gothic cathedrals of the Old World. Like their prototypes, too, they admit the light of heaven only through stained and pictured glass, thus filling the hall with many-colored radiance and painting its marble floor with beautiful or grotesque designs; so that its inmates breathe, as it were, a visionary atmosphere, and tread upon the fantasies of poetic minds.