The active traffic of the grain and provision trades of Chicago is conducted in the building of the Board of Trade, a tall and imposing structure at the head of La Salle Street, which makes a fitting close to the view along that grand highway. It is one of the most elaborate architectural ornaments of the city, and its surmounting tower rises three hundred and twenty-two feet from the pavement. The fame of this grand speculative arena is world-wide, and the animated and at times most exciting business done within marks the nervous beating of the pulse of this metropolis of food products. The interior is a magnificent hall, lighted by high-reaching windows and surmounted by a central skylight elevated nearly a hundred feet above the floor. Impressive columns adorn the sides, and the elaborate frescoes above are in keeping with its artistic decoration. Upon the spacious floor, between nine and one o'clock, assemble the wheat and corn, and pork, lard, cattle and railway kings in a typical scene of concentrated and boiling energy feeding the furnace in which Chicago's high-pressure business enterprise glows and roars. These speculative gladiators have their respective "pits" or amphitheatres upon the floor, so that they gather in huge groups, around which hundreds run and jostle, the scene from the overlooking gallery, as the crowds sway and squirm, and with their calls and shouting make a deafening uproar, being a veritable Bedlam. Each "pit" deals in a specific article, while in another space are detachments of telegraph operators working with nimble fingers to send instant reports of the doings and prices to the anxious outer world. High up on the side of the grand hall, in full view of all, are hung large dials, whose moving hands keep momentary record of the changes in prices made by the noisy and excited throngs in the "pits," thus giving notice of the ruling figures for the next month's "options" on wheat, corn and "short-ribs." There are tables for samples, and large blackboards bearing the figures of market quotations elsewhere. This Chicago Board of Trade has been the scene of some of the wildest speculative excitements in the country, as its shouting and almost frenzied groups of traders in the "pits" may make or break a "corner," and here in fitful fever concentrates the business energy of the great Metropolis of the Lakes. PULLMAN AND THE SLEEPING-CAR.